Complete A-Z List of Common File Extensions

There are many different file extensions. Some are for special programs like Microsoft Excel, Microsoft Word, Spreadsheet and the likes. So we have put down a complete list of file extensions that are very handy.
This post consist of a list of the most commonly found extensions, what type of file they are and what program if any they are associated with.

1. .$$$ Temporary file 
2. .$$A OS/2 program file 
3. .$$F OS/2 database file 
4. .$$S OS/2 spreadsheet file 
5. .$D$ OS/2 planner file 
6. .$DB DBASE IV temporary file 
7. .$ED Microsoft C temporary editor file. 
8. .$VM Microsoft Windows temporary file for virtual managers. 
9. ._DD Norton disk doctor recovery file. 
10. ._DM Nuts n Bolts disk minder recovery file. 
11. .— File used to backup sys, ini, dat, and other important files from Windows 3.1 and above. 
12. .075 Ventura Publisher 75×75 dpi screen characters 
13. .085 Ventura Publisher 85×85 dpi screen characters 
14. .091 Ventura Publisher 91×91 dpi screen characters 
15. .096 Ventura Publisher 96×96 dpi screen characters 
16. .0B Pagemaker printer font LineDraw enhanced characters. 
17. .1ST File used by some software manufacturers to represent a file that should be read first before starting the program. 
18. .2GR File used in Windows 3.x to display the graphics on older 286 and 386 computers. 
19. .386 Virtual machine support files for the 386 enhanced mode. 
20. .3GR File used in Windows 3.x to display the graphics on later 386, 486 and Pentium computers. 
21. .4SW 4DOS Swap file 
22. A ADA program file or UNIX library 
23. .A3W MacroMedia Authorware 3.5 file 
24. .ABK Autobackup file used with Corel Draw 6 and above. 
25. .ABR Brush file for Adobe Photoshop
26. .ACT Adobe Photoshop Color table file.
27. .AD After Dark file. 
28. .ADF Adapter description files. 
29. .ADM After Dark screen saver module. 
30. .ADR After Dark randomizer 
31. .AI Adobe Illustrator file. 
32. .AIF Auto Interchange File Format (AIFF) Audio file. 
33. .ANI Windows 95 / Windows 98 / Windows NT animated mouse cursor file.
34. .ANS ANSI text file. 
35. .ARJ Compressed file can be used with Winzip / Pkzip.
36. .ASC ASCII Text file .ASF Sort for Advanced Streaming Format, file developed by Microsoft.
37. The .ASF file is generally a movie player and can be open with software such as Windows Media Player. 
38. .ASP Microsoft FrontPage Active Server Pages. To open these files use your internet browser. 
39. .AVI Windows Movie file.
40. .BAK Backup file used for important windows files usually used with the System.ini and the Win.ini. 
41. .BAS QBasic program and or Visual Basic Module. 
42. .BAT Batch file that can perform tasks for you in dos, like a macro.
43. .BFC Microsoft Windows 95 / Windows 98 Briefcase file.
44. .BG Backgammon game file. 
45. .BIN Translation tables for code pages other than the standard 437. 
46. .BK2 Word Perfect for Windows Backup file 
47. .BK3 Word Perfect for Windows Backup file 
48. .BK4 Word Perfect for Windows Backup file 
49. .BK5 Word Perfect for Windows Backup file 
50. .BK6 Word Perfect for Windows Backup file 
51. .BK7 Word Perfect for Windows Backup file 
52. .BK8 Word Perfect for Windows Backup file 
53. .BK9 Word Perfect for Windows Backup file 
54. .BMP Graphical Bit Mapped File used in Windows Paintbrush.
55. .BNK Sim City Backup
56. .BPS Microsoft Works Word Processor File. 
57. .BPT Corel Draw Bitmap master file 
58. .BV1 Word Perfect for Windows Backup file 
59. .BV2 Word Perfect for Windows Backup file 
60. .BV3 Word Perfect for Windows Backup file 
61. .BV4 Word Perfect for Windows Backup file 
62. .BV5 Word Perfect for Windows Backup file 
63. .BV6 Word Perfect for Windows Backup file 
64. .BV7 Word Perfect for Windows Backup file 
65. .BV8 Word Perfect for Windows Backup file 
66. .BV9 Word Perfect for Windows Backup file 
67. .BWP BatteryWatch pro file.
68. .CC file used with the C programming language.
69. .CAB Cabinet file used in Windows 95 and Windows 98 that contains all the windows files and drivers. Information about how to extract
70. .CAB file can be found on document CH000363.
71. .CAL Windows Calendar, Supercalculator4 file or Supercal spreadsheet. 
72. .CBL COBOL Program File 
73. .CBT Computer Based Training files. 
74. .CDA CD Audio Player Track. 
75. .CDR Corel Draw Vector file.
76. .CFB Comptons Multimedia file 
77. .CFG Configuration file 
78. .CFL Corel flowchart file
79. .CFM Corel FontMaster file / Cold Fusion Template file / Visual dBASE windows customer form
80. .CHK Scandisk file which is used to back up information that scandisk has found to be bad, found in C root. Because the information within these files are corrupted or reported as bad by Scandisk it is perfectly fine to delete these files, providing you are currently not missing any information. Additional information about scandisk can be found on our scandisk page.
81. .CL Generic LISP source code. 
82. .CL3 Easy CD Creator layout file. 
83. .CL4 Easy CD Creator layout file. 
84. .CLA Java Class file. .CLG Disk catalog database 
85. .CLK Corel R.A.V.E. animation file.
86. .CLL Crick software clicker file 
87. .CLO Cloe image 
88. .CLP Windows Clipboard / Quattro Pro clip art / Clipper 5 compiler script 
89. .CLR WinEdit Colorization word list / 1st reader binary color screen image / PhotStyler color definition 
90. .CLS Visual Basic Class module / C++ Class definition 
91. .CMD Windows Script File also OS/2 command file. 
92. .CMV Corel Movie file.
93. .CNT Help file (.hlp) Contents (and other file contents) 
94. .CPL Windows 95 / Windows 98 / Windows NT control panel icons.
95. .CNE Configuration file that builds .COM files. 
96. .CNF Configuration file. 
97. .COB COBOL source code file. 
98. .COD FORTRAN Compiler program code 
99. .COM File that can be executed. 
100. .CPE Fax cover page file 
101. .CPI Code Page Information or Microsoft Windows applet control panel file 
102. .CPP C++ source code file. 
103. .CRD Windows Card file. 
104. .CSV Comma-Separated Variable file. Used primary with databases and spreadsheets / Image file used with CopuShow
105. .CUR Windows Mouse Cursor. 
106. .CVS Canvas drawing file 
107. .CXX C++ program file or Zortech C++ file  
108. .DAT Data file, generally associated or extra data for a program to use .DB Paradox database file / Progress database file .DB2 dBase II file 
109. .DBC Microsoft Visiual Foxpro database container
110. .DBF dBase II,III,III+,IV / LotusWorks database. 
111. .DBK dBase databse backup / Orcad schematic capture backup file 
112. .DBM Cold Fusion template 
113. .DBO dBase IV compiled program file 
114. .DBQ Paradox memo 
115. .DBT dBase database text file 
116. .DBV Flexfile memo field file 
117. .DBW DataBoss database file 
118. .DBX Database file / DataBeam Image / MS Visual Foxpro Table 
119. .DEV Device Driver
120. .DIF Document Interchange Format; VisiCalc 
121. .DLL Dynamic Link Library; Allow executable code modules to be loaded on demand, linked at run time, and unloaded when not needed. Windows uses these files to support foreign languages and international/nonstandard keyboards. 
122. .DMO Demo file 
123. .DMP Dump file 
124. .DMD Visual dBASE data module 
125. .DMF Delusion/XTracker Digital Music File 
126. .DMO Demo file 
127. .DMP Dump file 
128. .DMS Compressed archive file 
129. .DOC Microsoft Word Windows/DOS / LotusWorks word processor Windows/DOS /PF S:First Choice Windows/DOS DOT MS Word Windows/DOS. 
130. .DOS Text file and DOS Specification Info 
131. .DOT Microsoft Word Template (Macro).
132. .DRV Device driver files that attach the hardware to Windows. The different drivers are system, keyboard, pointing devices, sound, printer/ plotter, network, communications adapter. 
133. .DRW Micrografx draw/graph files. 
134. .DT_ Macintosh Data File Fork 
135. .DTA Data file 
136. .DTD SGML Document definition file 
137. .DTF Q&A database .DTM DigiRekker module 
138. .DTP SecurDesk! Desktop / Timeworks Publisher Text Document / Pressworks Template file 
139. .DUN Dialup Networking exported file. 
140. .DX Document Imaging file / Digital data exchange file
141. .DXB Drawing interchange binary file 
142. .DXF Autocad drawing interchange format file 
143. .DXN Fujitsu dexNet fax document 
144. .DXR Macromedia director projected movie file 
145. .DYN Lotus 1-2-3 file 
146. .DWG AutoCad Drawing Database
147. .EEB Button bar for Equation Editor in Word Perfect for Windows 
148. .EFT CHIWRITER high resolution screen characters 
149. .EGA EGA screen characters for Ventura Publisher 
150. .ELG Event List text file used with Prosa 
151. .EMS Enhanced Menu System configuration file for PC Tools 
152. .EMU IRMA Workstation for Windows emulation 
153. .ENC ADW Knowledge Ware Encyclopedia 
154. .END Corel Draw Arrow Definition file 
155. .ENG Sprint dictionary file engine 
156. .ENV Word Perfect for Windows environment file. 
157. .EPG Exported PaGe file used with DynaVox 
158. .EPS Encapsulated Postscript, with embedded TIFF preview images. 
159. .EQN Word Perfect for Windows Equation file 
160. .ERD Entity Relation Diagram graphic file 
161. .ERM Entity Relation Diagram model file 
162. .ERR Error log file 
163. .ESH Extended Shell Batch file 
164. .EVT Event file scheduler file for PC Tools 
165. .EX3 Device driver for Harvard graphics 3.0
166. .EXC QEMM exclude file from optimization file or Rexx program file 
167. .EXE Executable file. 
168. .EXT Extension file for Norton Commander F 
169. .FDF Adobe Acrobat Forms Document. 
170. .FF AGFA CompuGraphics outline font description. 
171. .FFA Microsoft Fast Find file.
172. .FFF GUS PnP bank / defFax fax document 
173. .FFL Microsoft Fast Find file / PrintMaster Gold form file
174. .FFO Microsoft Fast Find file
175. .FFT DCA/FFT final form text 
176. .FFX Microsoft Fast Find file
177. .FON Font files to support display and output devices. 
178. .FR3 dBase IV renamed dBase III+ form 
179. .FRF FontMonger Font 
180. .FRG dBase IV uncompiled report 
181. .FRK Compressed zip file used with Apple Macinotsh computers.
182. .FRM Form file used with various programs / Microsoft Visual Basic Form / FrameMaker document / FrameBuilder file / Oracle executable form / Word Perfect Merge form / DataCAD symbol report file 
183. .FRO dBase IV compiled report / FormFlow file 
184. .FRP PerForm Pro Plus Form 
185. .FRS WordPerfect graphics driver 
186. .FRT FoxPro report file 
187. .FRX Microsoft Visual basic binary form file / FoxPro report file
188. .FRZ FormFlow file
189. .GIF CompuServe Graphics Interchange Format. 
190. .GR2 286 grabbers that specify which font to use with DOS and Windows.
191. .GR3 386 grabbers that specify which font to use with DOS and Windows.
192. .GRA Microsoft Flight simulator graphics file
193. .GRB Microsoft MS-DOS shell monitor
194. .GRF Micrografx draw/graph files. 
195. .GRP Microsoft Program Group.
196. .GZ Compressed Archive file for GZip  
197. .HBK Mathcad handbook file 
198. .HDL Procomm Plus alternate download file listing 
199. .HDR Procomm Plus message header 
200. .HDX Help index 
201. .HEX Hex dump 
202. .HFI GEM HP font info 
203. .HGL HP graphics language graphic 
204. .HH C++ Header
205. .HHH Precompiled Header for Power C 
206. .HHP Help data for Procomm Plus 
207. .HLP Files that contain the Help feature used in windows, cannot be read from DOS.
208. .HQX Apple Macintosh Binhex text conversion file.
209. .HSQ Data files associated with the Qaz Trojan. 
210. .HSS Photoshop Hue/Saturation information. 
211. .HST History file / Procomm Plus History File / Host file. 
212. .HTA Hypertext Application (run applications from HTML document).
213. .HTML Web page files containing HTML or other information found on the Internet.
214. .ICA Citrix file / IOCA graphics file 
215. .ICB Targa Bitmap 
216. .ICC Kodak printer image 
217. .ICE Archive file 
218. .ICL Icon library file 
219. .ICM Image Color Matching profile file 
220. .ICN Microsoft Windows Icon Manager.
221. .ICO Microsoft Windows Icondraw / Icon.
222. .ID Disk identification file. 
223. .IDB Microsoft developer intermediate file, used with Microsoft Visual Studio
224. .IDD MIDI instruments definition 
225. .IDE Integrated Development Environment configuration file 
226. .IDF MIDI instruments drivers file 
227. .IDQ Internet data query file 
228. .IDX Index file 
229. .IFF IFF/LBM (Amiga) used by Computer Eyes frame grabber. 
230. .IMG GEM/IMG (Digital Research) or Ventura Publisher bitmap graphic 
231. .INF Information file that contains customization options. 
232. .INI Files that initialize Windows and Windows apps. 
233. .IPF Installer Script File / OS/2 online documentation for Microsoft source files. 
234. .ISO Compressed file used for an exact duplicate of a CD. 
235. .ISO files can be extracted or opened such programs as Win Image that can be found on our shareware download section.
236. .IWA IBM Writing Assistant Text file.
237. .JAS Graphic 
238. .JPG Graphic commonly used on the Internet and capable of being opened by most modern image editors. 
239. .JS JavaScript file. 
240. .JSB Henter-Joyce Jaws script binary file 
241. .JSD eFAX jet suite document 
242. .JSE JScript encoded script file 
243. .JSH Henter-Joyce Jaws script header file 
244. .JSL PaintShop pro file 
245. .JSM Henter-Joyce Jaws script message file 
246. .JSP Java server page 
247. .JSS Henter-Joyce Jaws script source file
248. .JT JT fax file 
249. .JTF JPEG tagged Interchange format file 
250. .JTK Sun Java toolkit file 
251. .JTP JetForm file 
252. .JW Justwrite text file 
253. .JWL Justwrite text file library 
254. .JZZ Jazz spreadsheet 
255. .KAR Karaoke File used with some audio players. 
256. .LGC Program Use Log File (for Windows Program Use Optimization). 
257. .LGO Contains the code for displaying the screen logo. 
258. .LOG Contains the process of certain steps, such as when running scandisk it will usually keep a scandisk .log of what occurred.
259.  .LNK HTML link file used with Microsoft Internet Explorer.
260. .LWP Lotus Wordpro 96/97 file.
261. .MAC Macintosh macpaint files. 
262. .MBX Microsoft Outlook Express mailbox file.
263. .MD Compressed Archive file 
264. .MDA Microsoft Access Add-in / Microsoft Access 2 Workgroup. 
265. .MDB Microsoft Access Database / Microsoft Access Application. 
266. .MDE Microsoft Access Database File 
267. .MDF Menu definition file 
268. .MDL Digitrakker Music Module / Rational Rose / Quake model file
269. .MDM Telix Modem Definition 
270. .MDN Microsoft Access Blank Database Template 
271. .MDP Microsoft Developer Studio Project 
272. .MDT Microsoft Access Add-in Data 
273. .MDW Microsoft Access Workgroup Information 
274. .MDX dBase IV Multiple Index 
275. .MDZ Microsoft Access Wizard Template 
276. .MEB WordPerfect Macro Editor bottom overflow file 
277. .MED WordPerfect Macro Editor delete save / OctaMed tracker module 
278. .MEM WordPerfect Macro Editor macro / Memory File of variables 
279. .MID Midi orchestra files that are used to play with midi sounds built within the sound card..MIX Power C object file / Multiplayer Picture file (Microsoft Photodraw 2000 & Microsoft Picture It!) / Command & Conquer Movie/Sound file
280. .MOD Winoldap files that support (with grabbers) data exchange between DOS apps and Windows apps. 
281. .MOV File used with Quick Time to display a move.
282. .MP1 MPEG audio stream, layer I 
283. .MP2 MPEG audio stream, layer II 
284. .MP3 MPEG audio stream, layer III; High compressed audio files generally used to record audio tracks and store them in a decent sized file available for playback. See our MP3 page for additional information.
285. .MPG MPEG movie file. 
286. .MSN Microsoft Network document / Decent mission file
287. .MTF Windows metafile. 
288. .MTH Derive Math file 
289. .MTM Sound file / MultiTracker music module 
290. .MTV Picture file 
291. .MTW Minitab data file 
292. .MU Quattro menu 
293. .MUL Ultima Online game 
294. .MUP Music publisher file 
295. .MUS Audio file 
296. .MVB Database file / Microsoft multimedia viewer file
297. .MVE Interplay video file
298. .MVF Movie stop frame file 
299. .MWP Lotus Wordpro 97 smartmaster file 
300. .MXD ArcInfo map file 
301. .MXT Microsoft C Datafile
302. .MYD Make your point presentation file. 
303. .N64 Nintendo 64 Emulator ROM image.
304. .NA2 Netscape Communicator address book. 
305. .NAB Novell Groupwise address book
306. .NAP Napster Music security definition file. 
307. .NDF NeoPlanet Browser file 
308. .NDX Indexed file for most databases. 
309. .NES Nintendo Entertainment system ROM image.
310. .NIL Norton guide online documentation 
311. .NGF Enterasys Networks NetSight file.
312. .NHF Nero HFS-CD compilation or a general Nero file 
313. .NIL Norton icon lybrary file. 
314. .NLB Oracle 7 data file 
315. .NLD ATI Radeon video driver file,
316. .NMI SwordSearcher file. 
317. .NON LucasArts Star Wars – Tie fighter mouse options file.
318. .NOW Extension commonly used for readme text files. 
319. .NRA Nero Audio CD file. 
320. .NRB Nero CD-ROM boot file. 
321. .NS2 Lotus Notes 2 database, 
322. .NS5 Lotus Notes Domino file, 
323. .NSO NetStudio easy web graphics file. 
324. .NT Windows NT startup file. 
325. .NUM File used with some Software Manufactures to store technical support numbers or other phone numbers, should be readable from DOS and or Windows. 
326. .OCA Control Typelib Cache. 
327. .OCX Object Linking and Embedding (OLE) control extension. 
328. .OLB Object library
329. .OLD Used for backups of important files incase they are improperly updated or deleted. 
330. .OLE Object Linking and Embedding object file 
331. .OLI Olivetti text file 
332. .ORI Original file. 
333. .PAB Personal Address Book, file used with Microsoft Outlook.
334. .PB WinFax Pro phone book file 
335. .PBD PowerBuilder dynamic library / Faxit phone book file 
336. .PBF Turtle Beach Pinnacle bank file 
337. .PBK Microsoft phonebook file
338. .PBL PowerBuilder library file 
339. .PBM UNIX portable bitmap fuke 
340. .PBR PowerBuilder resource 
341. .PBI Profiler binary input file 
342. .PBM PBM portable bit map graphic 
343. .PBO Profiler binary output 
344. .PBT Profiler binary table 
345. .PCX Microsoft Paint & PC Paintbrush Windows/DOS.
346. .PDA Bitmap graphic file 
347. .PDB TACT data file 
348. .PDD Adobe PhotoDeluxe Image.
349. .PDF Adobe Acrobat Reader file which can only be read by Adobe Acrobat (to get file downloaded Adobe Acrobat from our Download Page.
350. .PDL Borland C++ project description language file.
351. .PDS Graphic file / Pldasm source code file. 
352. .PDV Paintbrush printer driver. 
353. .PDW Professional Draw document. 
354. .PIC Picture / Viewer Frame Class. 
355. .PIF Program Information File that configures a DOS app to run efficiently in windows. 
356. .PJF Paintjet soft font file. 
357. .PL Harvard palette file / PERL program file
358. .PL3 Harvard chart palette 
359. .PLB Foxpro library / LogoShow Screensaver file 
360. .PLC Lotus Add-in 
361. .PLD PLD2 source file 
362. .PLG REND386 / AVRIL file 
363. .PLI Oracle 7 data description 
364. .PLL Prelinked library 
365. .PLM DisorderTracker2 module 
366. .PLN WordPerfect spreadsheet file 
367. .PLR Descent Pilot file
368. .PLS WinAmp MPEG playlist file / DisorderTracker 2 Sample file / Shoutcast file / MYOB data file 
369. .PLT AutoCAD HPGL vector graphic plotter file / Gerber sign-making software file / Betley’s CAD Microstation driver configuration for plotting 
370. .PLY Autodesk polygon 
371. .PP Compressed archive file.
372. .PP4 Picture Publisher.
373. .PP5 Picture Publisher. 
374. .PPA Power Point Add-in. 
375. .PPB WordPerfect Print preview button bar. 
376. .PPD PostScript Printer description. 
377. .PPF Turtle Beach Pinnacle program file. 
378. .PPM PBM Portable Pixelmap Graphic. 
379. .PPO Clipper Preprocessor Output. 
380. .PPP Serif PagePlus Publication. 
381. .PPS Microsoft PowerPoint Slideshow.
382. .PPT Microsoft PowerPoint presentation.
383. .PPX Serif PagePlus publication. 
384. .PPZ Microsoft PowerPoint Packaged Presentation.
385. .PS2 File to support the Micro Channel Architecture in 386 Enhanced mode. 
386. .PSD Adobe Photoshop image file.
387. .PST Post Office Box file used with Microsoft Outlook usually mailbox.pst unless named otherwise. 
388. .PWA Password agent file. 
389. .PWD Password file. 
390. .PWF ProCite Workforms 
391. .PWL Password file used in Windows 95 and Windows 98 is stored in the Windows directory. 
392. .PWP Photoworks image file 
393. .PWZ PowerPoint wizard 
394. .QIC Windows backup file 
395. .QT Quick Time Movie File 
396. .QXD Quark Express file 
397. .QXL Quark Xpress element library 
398. .QXT Quark Xpress template file 
399. .RA Real Audio file. 
400. .RAM Random Access Memory 
401. .RAR Compressed file similar to .ZIP uses different compression program to extract. See our recommended download page for a program that can be used to extract .RAR files. 
402. .RAS File extension used for raster graphic files.
403. .RD1 Descent registered level file
404. .RD3 Ray Dream designer graphics file / CorelDraw 3D file 
405. .RD4 Ray Dream designer graphics file 
406. .RD5 Ray Dream designer graphics file 
407. .RDB TrueVector rules database 
408. .RDF Resource description framework file / Chromeleon report definition 
409. .RDL Descent registered level file / RadioDestiny radio stream
410. .RDX Reflex data file 
411. .REC Sound file used with Windows Sound Recorder.
412. .RLE Microsoft Windows Run Length Encoded (Run Length Encoded (bitmap format) file that contains the actual screen logo). 
413. .RMI Microsoft RMID sound file. 
414. .RPB Automotive diagnostic file. 
415. .RPD Rapidfile database 
416. .RPM Red Hat Package Manager / RealMedia Player file.
417. .RPT Various Report file
418. .RTF Rich Text Format file 
419. .RWZ Microsoft Outlook rules wizard file 
420. .SAV File that usually contains saved information such as a saved game. 
421. .SC2 Maps used in Sim City 2000.
422. .SCP Dialup Networking script file. 
423. .SCR Source files for the .INI files, or sometimes may be used as screen savers. 
424. .SD Sound Designer I audio file 
425. .SD2 Sound Designer II flattened file / Sound Designer II data fork file / SAS database file 
426. .SDA StarOffice drawing file / SoftCuisine data archive 
427. .SDC StarOffice spreadsheet 
428. .SDD StarOffice presentation 
429. .SDF Standard data format file / Schedule data file / System file format / Autodesk mapguide spatial data file 
430. .SDK Roland S-series floppy disk image 
431. .SDL SmartDraw library 
432. .SDN Small archive 
433. .SDR SmartDraw drawing 
434. .SDS StarOffice chart file / Raw MIDI sample dump standard file 
435. .SDT SmartDraw template 
436. .SDV Semicolon divided value file 
437. .SDW Sun Microsystems StarOffice file document file similar to the Microsoft Office 
438. .DOC file. 
439. .SDX MIDI sample dump standard files compacted by SDX 
440. .SEA Short for Self Extracting Archive. Compressed file used with the Macintosh. 
441. .SH Archive file 
442. .SH3 Harvard (now Serif) presentation file 
443. .SHB Corel Background file 
444. .SHG Hotspot Editor Hypergraphic 
445. .SHK Macintosh Compressed Archive file 
446. .SHM WordPerfect Shell Macro 
447. .SHP 3D Studio Shapes File / other 3D related file 
448. .SHR Archive file 
449. .SHS Shell scrap object file 
450. .SHW Corel presentation / WordPerfect Slide Show / Show File 
451. .SLK Multiplan file. 
452. .SND Sound Clip file / Raw unsigned PCM data / AKAI MPC-series sample / NeXT sound / Macintosh sound resource file 
453. .SNG MIDI song 
454. .SNM Netscape Mail 
455. .SNO SNOBOL program file 
456. .SNP Snapview snapshot file 
457. .SUM Summary file. 
458. .SWF Macromedia Flash file. 
459. .SWP Extension used for the Windows Swap File usually Win386.Swp. This file is required by Windows and generally can grow very large in size sometimes up to several hundred megs. This file is used to swap information between currently running programs and or memory. If this file is deleted from the computer Windows will be unable to load and will need to be reinstalled. 
460. .SYS System and peripheral drivers. 
461. .TDF Trace Definition File used with OS/2 
462. .TGA Targa file 
463. .TIF Tag Image Format that includes most 24-bit color. 
464. .TLB Remote automation truelib files / OLE type library / Visual C++ type library 
465. .TLD Tellix file 
466. .TLE NASA two-line element set 
467. .TLP Microsoft project timeline file
468. .TLT Trellix web design file 
469. .TLX Trellix data file 
470. .TMP Temporary files. 
471. .TRM Windows Terminal. 
472. .TXT Text file that can be read from windows of from DOS by using the Edit, Type 
473. .UNI MikMod (UniMod) format file / Forcast Pro data file 
474. .UNK Unknown file type, sometimes used when a file is received that cannot be identified 
475. .UNX Text file generally associated with UNIX.
476. .URL File used with some browsers such as Internet Explorer linking you to different web pages. Internet Shortcut. 
477. .VB VBScript file 
478. .VBA vBase file 
479. .VBD ActiveX file 
480. .VBE VBScript encoded script file 
481. .VBG Visual Basic group project file 
482. .VBK VisualCADD backup file 
483. .VBL User license control file 
484. .VBP Visual Basic project file 
485. .VBR Remote automation registration files 
486. .VBS Microsoft Visual Basic Script file for quick programs and in some cases can be used as a virus file. 
487. .VBW Visual Basic project workplace 
488. .VBX Visual Basic extension file 
489. .VBZ Wizard launch file 
490. .VC VisiCalc Spreadsheet file. 
491. .VCD VisualCADD Drawing file. 
492. .VCE Natural MicroSystems voice file. 
493. .VCF vCard File / Vevi Configuration file. 
494. .VCS Microsoft Outlook vCalander file.
495. .VCT FoxPro class library. 
496. .VCW Microsoft Visual C++ workbench information file.
497. .VCX FoxPro class library. 
498. .VDA Targa bitmap 
499. .VDD Short for Virtual Device Driver. Additional information can be found here.
500. .VDO VDOScript file 
501. .VDX No such file extension – Likely you meant .vxd 
502. .VM Virtual Machine / Virtual Memory file.
503. .VMM Virtual Machine (Memory Manager) file. 
504. .VMF Ventura font characteristics file / FaxWorks audio file 
505. .VMH .VS2 Roland-Bass transfer file. 
506. .VSD Visio drawing. 
507. .VSL GetRight download list file. 
508. .VSS Visio stencil. 
509. .VST Video Template / Truevision Vista graphic / Targa Bitmap/ 
510. .VSW Visio workspace file. 
511. .VXD Windows system driver file allowing a driver direct access to the Windows Kernel, allowing for low level access to hardware. W 
512. .WAB Microsoft Outlook Express personal address book.
513. .WAD File first found in IdSoftware games such as DOOM, Quake, as well as most new games similar to these. 
514. .WAV Sound files in Windows open and played with sound recorder.
515. .WB1 Quattro Pro Notebook 
516. .WB2 Quattro Pro Spreadsheet 
517. .WBF Microsoft Windows Batch File
518. .WBK Wordperfect document / workbook 
519. .WBT Winbatch batch file 
520. .WCD Wordperfect macro token list 
521. .WCM Microsoft Works data transmission file / Wordperfect Macro
522. .WCP Wordperfect product information description 
523. .WDB Microsoft Works database
524. .WEB Web source code file 
525. .WFM dBASE Form object 
526. .WFN CorelDRAW font 
527. .WFX Winfax data file 
528. .WG1 Lotus 1-2-3 worksheet
529. .WG2 Lotus 1-2-3 for OS/2 worksheet
530. .WID Ventura publisher width table 
531. .WIN Foxpro – dBASE window file 
532. .WIZ Microsoft Publisher page wizard
533. .WK1 Lotus 1-2-3 all versions / LotusWorks spreadsheet.
534. .WK3 Lotus 1-2-3 for Windows /Lotus 1-2-3 Rel.3.
535. .WKS Lotus 1-2-3 Rel lA,2.0,2.01, also file used with Microsoft Works.
536. .WLG Dr. Watson log file.
537. .WMA Windows Media Audio file. 
538. .WMF Windows Metafile. Also see WMF dictionary definition.
539. .WMZ Windows Media Player theme package file. 
540. .WPD WordPerfect Windows/DOS.
541. .WPG WordPerfect Graphical files Windows/DOS. 
542. .WPM WordPerfect Macro file. 
543. .WPS MS Works word processor Windows/DOS. 
544. .WRI Windows Write. 
545. .WRK Lotus 1-2 31.0,1.01,1.1/ Symphony 1,1.01. 
546. .WRI Symphony l.1,1.2,2 / Microsoft Write file.  
547. .XIF Wang image file / Xerox image file 
548. .XLB Microsoft Excel File.
549. .XLS Microsoft Excel File.
550. .XM Sound file / Fast tracker 2 extended module 
551. .XML Extensible markup language file. 
552. .XNK Exchange shortcut .
553. XOT Xnetech job output file 
554. .XPM X picsmap graphic 
555. .XQT SuperCalc macro sheet 
556. .XRF Cross Reference 
557. .XR1 Epic MegaGames Xargon File
558. .XSL XML Style sheet 
559. .XSM LEXIS-NEXIS tracker 
560. .XTB LocoScript external translation table 
561. .XWD X Windows dump file
562. .XWF Yamaha XG Works file 
563. .XXE Xxencoded file 
564. .XY XYWrite text file 
565. .XY3 XYWrite text file 
566. .XY4 XYwrite IV document 
567. .XYP XYwrite III plus document 
568. .XYW XYwrite Windows 4.0 document  Amiga YABBA compressed file archive 
569. .Y01 Paradox index file 
570. .Y02 Paradox index file 
571. .Y03 Paradox index file 
572. .Y04 Paradox index file 
573. .Y05 Paradox index file 
574. .Y06 Paradox index file 
575. .Y07 Paradox index file 
576. .Y08 Paradox index file 
577. .Y09 Paradox index file 
578. .YUV Yuv graphics file 
579. .YZ YAC compressed file archive.  
580. Compressed file that can hold thousands of files. To extract all the files Pkzip or Winzip will need to be used. UNIX / Linux users use the compress / uncompress command to extract these files. 
581. .ZIP Compressed file that can hold thousands of files. To extract all the files Pkzip or Winzip will need to be used