The file extension list you requested is shown on this page. It loads as a table so please give it a moment as some of the lists are quite long. These lists contain basic information: the extension, the name of the program it works with, the specific function of the file, and the company that makes the program. Not all extensions have all of the data. Click on the extension of interest to see the detail page for that extension. Total extensions in this particular list: 151.
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| Extension |
Information |
| !BT |
BitTorrent Partially Downloaded File (Bram Cohen; now maintained by BitTorrent, Inc.) |
| !C |
Graphics Converter Pro |
| !UT |
µTorrent Incomplete Download (Ludvig Strigeus) |
| ### |
DoubleSpace Compressed Volume |
| ### |
QTIC Temporary File |
| ### |
Temporary File |
| #01 |
Numbered Picture Files |
| #24 |
Locoscript 24-pin Printer Data File (LocoScript Software) |
| #GF |
MetaFont Font File |
| #IB |
Locoscript Dot Matrix Data File (LocoScript Software) |
| #SC |
Locoscript Dot Matrix Data File (LocoScript Software) |
| #ST |
Locoscript Dot Matrix Printer Definition File (LocoScript Software) |
| #VC |
ViewChoice Compressed File (Payroll Associates, LLC) |
| $ |
BASIC VB VB1D Komp Symbole File |
| $#! |
Cryptext |
| $#! |
AOL 5.0 Virchk File (America Online, Inc.) |
| $$$ |
Backup |
| $$$ |
Used by OS/2 to keep track of archived files |
| $$$ |
Temporary File |
| $$A |
OS/2 (IBM) |
| $$F |
OS/2 Database (IBM) |
| $$M |
3D GameStudio Backup Map (Conitec Datasystems, Inc) |
| $$P |
OS/2 Notes (IBM) |
| $$S |
OS/2 Spreadsheet (IBM) |
| $$_ |
Midiprg Capella Compressed File |
| $00 |
DOS Pipe File |
| $01 |
Midi File |
| $01 |
DOS Pipe File |
| $02 |
DOS Pipe File |
| $02 |
Midi File |
| $03 |
DOS Pipe File |
| $04 |
DOS Pipe File |
| $05 |
DOS Pipe File |
| $1 |
ZX Spectrum-Emulator |
| $A |
AutoCAD Autosave File (Autodesk, Inc.) |
| $AC |
AutoCAD Autosave File (Autodesk, Inc.) |
| $AC |
$&Sense Data File (Monogram Software/Software Toolworks/The Learning Company) |
| $B5 |
Apple II ProDOS 16 or GS/OS Shell Application (Apple Inc.) |
| $C |
Graphics Converter Pro |
| $D$ |
OS/2 Planner Data File |
| $DB |
dBASE Temp File |
| $DX |
Ca Visual Objects Platform for Developer (CAVO) Backup Index File (CA) |
| $ED |
C Editor Temporary File (Microsoft Corporation) |
| $ED |
C/C++ Temporary Editor File (Microsoft Corporation) |
| $EU |
Midiprg Mustat Compressed File |
| $ID |
Cubase Compressed File (Steinberg) |
| $LL |
Cubase Compressed File (Steinberg) |
| $LN |
C++ TLink Response File (Borland Software Corporation) |
| $NG |
Midiprg Mustat Compressed File |
| $OL |
DOS Pipe File |
| $ON |
Cubase Fonts Compressed File (Steinberg) |
| $RI |
Cubase Audio Compressed File (Steinberg) |
| $RR |
Cubase Compressed File (Steinberg) |
| $S |
Graphics Converter Pro |
| $TF |
Cubase Fonts Compressed File (Steinberg) |
| $VM |
Windows 3.x Virtual Manager Temp File (Microsoft Corporation) |
| $WM |
Epson Creative Studio Example File (Epson Corporation) |
| $XE |
Mustat Compressed Audio File |
| &&& |
Temporary File |
| (D) |
pcAnywhere Temporary File |
| )2( |
LHA Archiver Temporary File |
| --- |
Windows Temporary File |
| --- |
Microsoft Backup File Set (Microsoft Corporation) |
| -5 |
Audio Utility Tuningwrench Compressed File |
| .REASON |
REASON REASON (Propellerhead) |
| .SSKD |
On Schedule (Squidge Software) |
| ??? |
ANY Three Character Audio File |
| ??? |
Trend Micro Virus Pattern File (Trend Micro, Inc.) |
| ??Z |
LoseThos Compressed File (Terry A. Davis) |
| ??_ |
Microsoft SZDD compressed (Haruhiko Okumura's LZSS) |
| ??_ |
Microsoft KWAJ compressed (Phil Katz's 'deflate') |
| ??_ |
InstallShield Compressed File (Acresso Software Inc.) |
| ?Q? |
Squeeze |
| @@@ |
Codeview for C (Microsoft Corporation) |
| @@@ |
Screen Files |
| @HA |
E-mail Animator (IMSI/Design LLC) |
| [B] |
Amiga Paint File (Amiga) |
| _00 |
Soundtrack Compressed File |
| _01 |
Soundtrack Compressed File |
| _01 |
Compressed BIOS File |
| _02 |
Soundtrack Compressed File |
| _1 |
Audio Utility Tuningwrench Compressed File |
| _2 |
Audio Utility Tuningwrench Compressed File |
| _3 |
Audio Utility Tuningwrench Compressed File |
| _8 |
Audio Utility Tuningwrench Compressed File |
| _CRYPT |
Virus.Win32.Gpcode.ak Encrypted Document |
| _DB |
Stratum Data Icons File |
| _DD |
Norton Disk Doctor Recovered File (Symantec Corporation) |
| _DL |
Form of DLL File |
| _DM |
Nuts n Bolts Disk Minder Recovered File |
| _EX |
Form of EXE File |
| _H |
Type Manager Japanese Font Outline (Adobe Systems Incorporated) |
| _MP |
InstallShield Temporary Installer File (Acresso Software Inc.) |
| _NT |
Form of NT File |
| _RS |
RVS-COM Service Pack (Living Byte Software GmbH) |
| _SLN |
Visual Studio Solution (Microsoft Corporation) |
| _SLN60 |
Visual Studio 6.0 Solution (Microsoft Corporation) |
| _SLN70 |
Visual Studio .NET 2002 Solution (Microsoft Corporation) |
| _SLN71 |
Visual Studio .NET 2003 Solution (Microsoft Corporation) |
| _SLN80 |
Visual Studio 2005 Solution (Microsoft Corporation) |
| _SLN90 |
Visual Studio 2008 Solution (Microsoft Corporation) |
| _SY |
Form of SYS File |
| _V |
Type Manager Japanese Font Metrics (Adobe Systems Incorporated) |
| _VBXSLN80 |
Visual Basic Express 2005 Solution (Microsoft Corporation) |
| _VBXSLN90 |
Visual Basic Express 2008 Solution (Microsoft Corporation) |
| _VCPPXSLN80 |
Visual C++ Express 2005 Solution (Microsoft Corporation) |
| _VCPPXSLN90 |
Visual C++ Express 2008 Solution (Microsoft Corporation) |
| _VCSXSLN80 |
Visual C# Express 2005 Solution (Microsoft Corporation) |
| _VCSXSLN90 |
Visual C# Express 2008 Solution (Microsoft Corporation) |
| _VJSXSLN80 |
Visual J# Express 2005 Solution (Microsoft Corporation) |
| _VWDXSLN80 |
Visual Web Developer Express 2005 Solution (Microsoft Corporation) |
| _VWDXSLN90 |
Visual Web Developer Express 2008 Solution (Microsoft Corporation) |
| _VX |
Form of VXD File |
| _ZA |
CleverZip Temporary File |
| __A |
FFSJ Split/Join File (Fast File Joiner) |
| __INCOMPLETE___ |
WinMX Incomplete Download (Frontcode Technologies) |
| ___ |
Adinf table |
| ___FPE |
Folder Password Expert Protected Folder (ZQS Software Team) |
| {PB |
Backup |
| {SA}PROJ |
{smartassembly} Project (Cachupa) |
| {SA}REPORT |
{smartassembly} Exception Report (Cachupa) |
| ~ |
Temporary File |
| ~$~ |
1st Reader Temporary File |
| ~01 |
(~01..~99) Norton Editor Backup File |
| ~1~ |
Illum Source File |
| ~?? |
Locked File |
| ~AP |
C++ AppExpert Project Database File (Borland Software Corporation) |
| ~BM |
Img RC File |
| ~CU |
Cursor File |
| ~DE |
C++ Project Backup File (Borland Software Corporation) |
| ~DF |
Delphi DFM File Backup (Borland Software Corporation) |
| ~DFM |
Delphi Backup File (Borland Software Corporation) |
| ~DP |
Delphi DPR File Backup (Borland Software Corporation) |
| ~DR |
ARKEY Drawing Backup |
| ~H |
AZZ Cardfile Heap (Antanas Zdramys) |
| ~I |
AZZ Cardfile Index (Antanas Zdramys) |
| ~MN |
Norton Commander Menu Backup |
| ~NT |
NT Install Files |
| ~NT |
XP Install File |
| ~PA |
Delphi PAS File Backup (Borland Software Corporation) |
| ~PAS |
Delphi Backup (Borland Software Corporation) |
| ~PR |
Terramodel Project Backup |
| ~RE |
Image File |
| ~SG |
TAPCIS Message Index File |
| ~T~ |
RK Archiver Temporary File (RK Software) |
| ~_~ |
Temporary File (Microsoft Corporation) |
| ~~A |
Ap File |
| ~~D |
Windows Applog File |
| ~~F |
Windows Applog File |
| ~~M |
Windows Applog File |
| ~~~ |
Temporary file |
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