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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .000 | Microsoft Corporation | System Files | Indexing Service Data File | cabextract | Open Source |
| .004 | SourceForge | Compressed Files | Compressed File From A Multi-volume Archive (part 4) | PeaZip | Open Source |
| .005 | bhv | Data Files | Winfunktion Mathematik V8.0 Julia Fractal File | PeaZip | Open Source |
| .006 | bhv | Data Files | Winfunktion Mathematik V8.0 Julia Fractal File | PeaZip | Open Source |
| .007 | bhv | Data Files | Winfunktion Mathematik V8.0 Julia Fractal File | PeaZip | Open Source |
| .008 | ESRI (Environmental Systems Research Institute) | GIS Files | International S-57 Hydrographic Data Electronic Navigation Chart | PeaZip | Open Source |
| .009 | bhv | Data Files | Winfunktion Mathematik V8.0 Julia Fractal File | PeaZip | Open Source |
| .010 | bhv | Data Files | Winfunktion Mathematik V8.0 Julia Fractal File | PeaZip | Open Source |
| .015 | bhv | Data Files | Winfunktion Mathematik V8.0 Julia Fractal File | HJ-Split | Open Source |
| .022 | bhv | Data Files | Winfunktion Mathematik V8.0 Julia Fractal File | HJ-Split | Open Source |
| .026 | bhv | Data Files | Winfunktion Mathematik V8.0 Julia Fractal File | HJ-Split | Open Source |
| .035. | bhv | Data Files | Winfunktion Mathematik V8.0 Julia Fractal File | HJ-Split | Open Source |
| .036 | bhv | Data Files | Winfunktion Mathematik V8.0 Julia Fractal File | HJ-Split | Open Source |
| .046 | bhv | Data Files | Winfunktion Mathematik V8.0 Julia Fractal File | HJ-Split | Open Source |
| .10 | IBM | Data Files | IBM Voice Type Languages Scripts Data File | SMPlayer | Open Source |
| .12 | IBM | Data Files | IBM Voice Type Languages Scripts Data File | SMPlayer | Open Source |
| .123 | IBM | Spreadsheet Files | Lotus 1-2-3 Spreadsheet | Gnumeric | Open Source |
| .13 | IBM | Data Files | IBM Voice Type Languages Scripts Data File | SMPlayer | Open Source |
| .14 | PTC | Backup Files | Versioned Pro/Engineer Project File | SMPlayer | Open Source |
| .15 | IBM | Data Files | IBM Voice Type Languages Scripts Data File | SMPlayer | Open Source |
| .16 | Ubisoft | Game Files | Salt Lake Winter Olympics 2002 Game Music File | Linux | Open Source |
| .17 | IBM | Data Files | IBM Voice Type Languages Scripts Data File | SMPlayer | Open Source |
| .19 | IBM | Data Files | IBM Voice Type Languages Scripts Data File | SMPlayer | Open Source |
| .1M | Red Hat | Data Files | Cygwin Main Data | Cygwin | Open Source |
| .22 | Open Source | Data Files | Linux File | Linux | Open Source |
| .264 | Unknown Developer | Video Files | Ripped Video Data File | StaxRip | Open Source |
| .3DO | Open Source | Disk Image Files | FreeDO Phoenix ISO Image | FreeDO | Open Source |
| .3DR | Open Source | Data Files | 3D Rad Project File | 3D Rad | Open Source |
| .3DS | Autodesk, Inc. | 3D Image Files | 3D Studio Scene | MeshLab | Open Source |
| .3DXML | Dassault Systèmes | 3D Image Files | Dassault Systemes 3D XML File | GLC_Player | Open Source |
| .3GPA | Open Source | Audio Files | 3GPP Multimedia File | Eltima Elmedia Player | Open Source |
| .3MF | Open Source | 3D Image Files | 3D Manufacturing File | Cura Software | Open Source |
| .3P2 | Open Source | Audio Files | 3GPP Multimedia File | Eltima Elmedia Player | Open Source |
| .4 | IBM | Data Files | IBM Voice Type Languages Scripts Data File | SMPlayer | Open Source |
| .47 | The FreeBSD Community | Data Files | FreeBSD/NetBSD Data | NetBSD | Open Source |
| .4TH | Open Source | Developer Files | Forth Language File | KDevelop | Open Source |
| .5A | Open Source | Data Files | Linux Data File | Linux | Open Source |
| .64D | Open Source | Data Files | C64 PC64 Emulator File | VICE | Open Source |
| .64K | Open Source | Data Files | C64 PC64 Emulator File | VICE | Open Source |
| .669 | Open Source | Audio Files | UNIS Composer 669 Module | Schism Tracker | Open Source |
| .68K | Sega | Game Files | SEGA Mega Drive & Genesis Classics ROM File | MAME | Open Source |
| .A | Open Source | Developer Files | Static Library | gVim | Open Source |
| .A00 | Robert K. Jung | Compressed Files | Split Multi-volume ARJ Compressed File Archive | ZipZag | Open Source |
| .A01 | Robert K. Jung | Compressed Files | Split Multi-volume ARJ Compressed File Archive | ZipZag | Open Source |
| .A02 | Robert K. Jung | Compressed Files | Split Multi-volume ARJ Compressed File Archive | ZipZag | Open Source |
| .A03 | Robert K. Jung | Compressed Files | Split Multi-volume ARJ Compressed File Archive | ZipZag | Open Source |
| .A04 | Robert K. Jung | Compressed Files | Split Multi-volume ARJ Compressed File Archive | ZipZag | Open Source |
| .A05 | Robert K. Jung | Compressed Files | Split Multi-volume ARJ Compressed File Archive | ZipZag | Open Source |
| .A06 | Robert K. Jung | Compressed Files | Split Multi-volume ARJ Compressed File Archive | ZipZag | Open Source |
| .A07 | Robert K. Jung | Compressed Files | Split Multi-volume ARJ Compressed File Archive | ZipZag | Open Source |
| .A08 | Robert K. Jung | Compressed Files | Split Multi-volume ARJ Compressed File Archive | ZipZag | Open Source |
| .A09 | Robert K. Jung | Compressed Files | Split Multi-volume ARJ Compressed File Archive | ZipZag | Open Source |
| .A1 | Open Source | Compressed Files | Free Pascal Archive | Free Pascal | Open Source |
| .A10 | Robert K. Jung | Compressed Files | Split Multi-volume ARJ Compressed File Archive | ZipZag | Open Source |
| .A11 | Robert K. Jung | Compressed Files | Split Multi-volume ARJ Compressed File Archive | ZipZag | Open Source |
| .A2L | Vector Informatik | CAD Files | ASAP2 ECU Description File | Hexplorer | Open Source |
| .A32 | Robert K. Jung | Compressed Files | Split Multi-volume ARJ Compressed File Archive | ZipZag | Open Source |
| .A52 | Atari Corporation | Game Files | Atari 5200 ROM | MESS | Open Source |
| .AAC | Xilisoft Corporation | Audio Files | Advanced Audio Coding File | Media Player Classic | Open Source |
| .AB6 | SINTEF | Data Files | ABStat Data | ABstat | Open Source |
| .ABC | Adobe Systems Incorporated | Developer Files | ActionScript Byte Code File | ABC Programming langauge | Open Source |
| .ABI | Thomas Hall | Data Files | DNA Chromatogram File | AbiWord | Open Source |
| .ABK | Corel | Backup Files | Automatic Backup File | Arena | Open Source |
| .ABW | Abisource | Text Files | AbiWord Document | AbiWord | Open Source |
| .ACC | FKJ Software | Data Files | Graphics Accounts Data File | Gemulator | Open Source |
| .ACD | Sony Creative Software | Audio Files | ACID Project File | Alan System | Open Source |
| .ACX | Atari Corporation | Game Files | Atari ST Program | Gemulator | Open Source |
| .AD3 | Open Source | Audio Files | ADPCM 3-bit Compressed Voice | SoX | Open Source |
| .ADA | Open Source | Developer Files | Ada Source Code | GNAT | Open Source |
| .ADB | Open Source | Developer Files | Ada Body File | GNAT | Open Source |
| .ADF | Cloanto Corporation | Disk Image Files | Amiga Disk File | E-UAE | Open Source |
| .ADIUMEMOTICON | The Adium team | Data Files | Adium Dock Icon File | Adium | Open Source |
| .ADIUMMENUBARICONS | Adam Iser | Settings Files | Adium Menu Bar Icon File | Adium | Open Source |
| .ADIUMMESSAGESTYLE | Adam Iser | Settings Files | Adium Message Style Settings | Adium | Open Source |
| .ADIUMPLUGIN | Adam Iser | Plugin Files | Adium Plugin File | Adium | Open Source |
| .ADIUMSCRIPTS | Adam Iser | Developer Files | Adium AppleScripts File | Adium | Open Source |
| .ADIUMSERVICEICONS | Adam Iser | Data Files | Adium Service Icons | Adium | Open Source |
| .ADIUMSOUNDSET | The Adium team | Settings Files | Adium Sound Set File | Adium | Open Source |
| .ADIUMSTATUSICONS | Adam Iser | Data Files | Adium Status Icon | Adium | Open Source |
| .ADK | IBM | Backup Files | OS/2 Saved SKF Format | Angry Duck Ransomware | Open Source |
| .ADOC | Stuart Rackham | 3D Image Files | AsciiDoc File | AbiWord | Open Source |
| .ADS | Open Source | Developer Files | Ada Specification File | GNAT | Open Source |
| .ADZ | GNU Project | Disk Image Files | Compressed Amiga Disk File | WinFellow | Open Source |
| .AES | Open Source | Encoded Files | AES Crypt Encrypted File | Packetizer AES Crypt | Open Source |
| .AES256 | Unknown Developer | Encoded Files | Insurance.aes256 Encrypted File | Packetizer AES Crypt | Open Source |
| .AGC | John Bridges | Developer Files | AfterGRASP Compiled Script | AfterGRASP | Open Source |
| .AGE OF EMPIRES / AGE OF MYTHOLOGY GAME FILE | Microsoft Corporation | Game Files | Age Of Empires/Age Of Mythology Game File | Dragon UnPACKer | Open Source |
| .AGR | Ableton | Audio Files | Ableton Groove File | GRACE | Open Source |
| .AGS | John Bridges | Developer Files | AfterGRASP Script File | AfterGRASP | Open Source |
| .AGX | Open Source | Game Files | AGT Game File | AGiliTy | Open Source |
| .AHK | Open Source | Executable Files | AutoHotkey Script | AutoHotkey | Open Source |
| .AHL | Open Source | Settings Files | eMule Metadata | eMule | Open Source |
| .AHX | Abyss | Audio Files | WinAHX Tracker Module | CocoModX | Open Source |
| .AI4 | Adobe Systems Incorporated | Vector Image Files | Encapsulated PostScript File | Scribus | Open Source |
| .AIA | MIT Media Lab | Uncommon Files | App Inventor Project | Analytical Data Interchange | Open Source |
| .ALA | Open Source | Game Files | Alan Game File | Alan System | Open Source |
| .ALE | Avid Technology | Video Files | Avid Log Exchange File | Notepad2 | Open Source |
| .AMF | Autodesk, Inc. | 3D Image Files | Additive Manufacturing File | ModPlug Player | Open Source |
| .AMXX | Open Source | Plugin Files | AMX Mod X Plugin File | AMX Mod X | Open Source |
| .ANS | Open Source | Text Files | ANSI Text File | Notepad2 | Open Source |
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