List of filename extensions
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This alphabetical list of filename extensions contains standard extensions associated with computer files.
!$@[edit]
| Ext. | Description | Used by |
|---|---|---|
| ### | Temporary file | Program-dependent format |
| #24 | Printer data file for 24-pin matrix printer | LocoScript |
| #IB | Printer data file | LocoScript |
| #nn | Part of file image | Long |
| #SC | Printer data file | LocoScript |
| #ST | Standard mode printer definitions | LocoScript |
| $$$ | OS/2 archive file (i.e. archives$.$$, keys$.$$) | OS/2 |
| $$$ | Temporary file | |
| $? | ZX Spectrum file in HOBETA format | |
| $00 | Pipe file | DOS |
| $DB | Database temporary file | dBase |
| $O1 | Pipe file | DOS |
| $VM | Virtual manager temporary file | Windows 3.x |
| &01, &02, etc | Holdfast backup archive files | Holdfast |
| )2( | LHA archiver temporary file | LHA |
| ??$ | Backup file | P-CAD |
| ??_ | Microsoft packed file | Expand. Note: ?? could be any first two characters in a file extension (e.g. BM_ for compressed bitmap (BMP), DL_ for compressed library, etc.) Files compressed using this method have been in use on Microsoft software CDs and floppies since around 1995. |
| ?DK | Disk image | Loaddskf.exe |
| ?UT | Nonpacked FTN mail (? - flavor) | FidoNet |
| !qB | Unfinished qBittorrent download | qBittorrent |
| !ut | Unfinished μTorrent download | μTorrent |
| @@@ | DOS 2.0 - 3.2 backup control file | DOS commands BACKUP and RESTORE |
| ___ | Adinf table | Adinf |
| ?Q? | Squeeze | CP/M and MS-DOS |
| ~$~ | Temporary file | 1st Reader |
| ~1~, ~2~, etc. | Backup file (name is constructed with numbered backup option by appending ~, the incremented number, and another ~ after the original name) | GNU coreutils (cp, install, ln, mv ), Emacs |
| ~?? | Old Backup files (.MNU to .~MN) | Resource Workshop (Borland Delphi) |
| ~H | Cardfile heap | AZZ Cardfile |
| μ | Metrowerks Codewarrior project | |
| Π | THINK C project |
0–9[edit]
| Ext. | Description | Used by |
|---|---|---|
| 0 | Compressed harddisk data | DoubleSpace |
| 0B | Printer font with lineDraw extended character set | PageMaker |
| 001, 002, ... | Split parts of a single whole file | FFSJ, HJSplit, JJSplit, split (Unix) (when using numeric suffixes) |
| 1 | Fax | (Many programs) |
| 1 | Roff/nroff/troff/groff source for manual page | cawf2.zip |
| 123 | Spreadsheet | Lotus 1-2-3 version 9 and version 97 |
| 123dx | CAD drawing file | Autodesk 123D design file, a ZIP file format package containing a .sat file and .png thumbnails.[1] |
| 15U | Printer font with PI font set | PageMaker |
| 16 | SYSLINUX Splash Screen Graphic | SYSLINUX, XnView |
| 1ST | Usually README.1ST text file | |
| 1TX | 1toX Logipole file | |
| 2GR | 286 Grabber File | Win |
| 301 | Fax | Super FAX 2000 - Fax-Mail 96 |
| 386 | Intel 80386 processor driver | Windows 3.x |
| 386 | Windows virtual device driver | Win |
| 3D | Universal Combat 3D model file | Universal Combat |
| 3DMF | QuickDraw 3D Metafile | QuickDraw |
| 3DS | 3D Studio Graphics format | 3D Studio |
| 3DSX | Nintendo 3DS Homebrew File Format | Nintendo 3DS Homebrew Launcher |
| 3DT | Database in which the meta-data of a 3D Topicscape is held | 3D Topicscape |
| 3DV | 3-D wireframe graphics by Oscar Garcia | 3dv wireframe viewer |
| 3FX | Effect | CorelChart |
| 3G2 | Mobile Phone Video | |
| 3GA | Mobile Phone Audio (Samsung) | |
| 3GP | Mobile Phone Video | |
| 3GR | 386 Grabber File | Win |
| 3MF | 3D Manufacturing Format | 3D Builder |
| 3T4 | Binary file converter to ASCII | Util3 |
| 4DB | 4D Structure File | 4D |
| 4DD | 4D Data File | 4D |
| 4DIndy | 4D Structure Index File | 4D |
| 4C$ | Datafile | 4Cast/2 |
| 4MD | Musical file | |
| 4SW | 4DOS Swap File | 4DOS |
| 4TH | FORTH source code file | ForthCMP - LMI Forth |
| 555 | 16 bit per pixel image file format (5bit per component) | Sierra Entertainment |
| 602 | Text (fairly simple format, plain text with binary control commands embedded within text lines and special formatting commands on dedicated lines) | Text602 text processor by Software602 |
| 668 | Music (the mixing is always at 12048 Hz) | |
| 669 | Music (8 channels) | The 669 Composer |
| 6CM | Music (6 Channel Module) | Triton FastTracker |
| 75 | 75×75 dpi display font | Ventura Publisher |
| 7z | A compressed archive file format that supports several different data compression, encryption and pre-processing algorithms | 7-Zip |
| 8 | A86 assembler source code file | |
| 85 | 85×85 dpi display font | Ventura Publisher |
| 8BF | Adobe Photoshop compatible filters/plugins | |
| 8BI | Adobe Photoshop compatible filters/plugins | |
| 8BX | Adobe Photoshop compatible filters/plugins | |
| 890 | ScanTitling subtitle files | |
| 8CM | Music (8 Channel Module) | Triton FastTracker |
| 8M | Printer font with Math 8 extended character set | PageMaker |
| 8U | Printer font with Roman 8 extended character set | PageMaker |
| 83p | Executable program for TI-83 Graphing Calculator | TI Connect |
| 89p | Executable program for TI-89/89 Titanium Graphing Calculator | TI Connect |
| 8xp | Executable program for TI-83/84 Plus Graphing Calculator | TI Connect |
| 91 | 91×91 dpi display font | Ventura Publisher |
| 96 | 96×96 dpi display font | Ventura Publisher |
