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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .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 |
| .ANT | Open Source | Data Files | Radio Mobile Antenna Definition | Radio Mobile | Open Source |
| .AOI | Open Source | 3D Image Files | Art Of Illusion 3D Scene | Art of Illusion | Open Source |
| .APT | Apache Software Foundation | Text Files | Almost Plain Text File | AbiWord | Open Source |
| .AQM | Psyberia | GIS Files | AlpineQuest Map File | Mobile Atlas Creator | Open Source |
| .AQZ | Open Source | Data Files | Amateur Radio Questionary Data File | AQZ File Parser for Java | Open Source |
| .ARA | Open Source | Compressed Files | Archivaldo Resource Archive | Archivaldo | Open Source |
| .ARC | Symantec Corporation | Backup Files | Norton Backup Archive | PeaZip | Open Source |
| .ARJ | Robert K. Jung | Compressed Files | ARJ Compressed File Archive | ExtractNow | Open Source |
| .ART | Autodesk, Inc. | CAD Files | ArtCAM Model | Artifacts | Open Source |
| .AS | Adobe Systems Incorporated | Developer Files | Adobe ActionScript File | FlashDevelop | Open Source |
| .ASC | Symantec Corporation | Encoded Files | PGP (Pretty Good Privacy) ASCII Armored File | Notepad2 | Open Source |
| .ASCII | Sublime HQ Pty Ltd | Text Files | ASCII Text | Notepad2 | Open Source |
| .ASE | Adobe Systems Incorporated | Settings Files | Adobe Swatch Exchange File | Notepad2 | Open Source |
| .ASH | Nintendo | Uncommon Files | Nintendo Wii System Menu File | Easy CSM | Open Source |
| .ASHX | Microsoft Corporation | Web Files | ASP.NET Web Handler File | AbiWord | Open Source |
| .ASM | Open Source | Developer Files | Assembly Language Source Code File | gVim | Open Source |
| .ASZ | Open Source | Developer Files | AlphaControls Skin Package | AlphaControls | Open Source |
| .ATG | Unknown Developer | Uncommon Files | Netmino File | Coco/R | Open Source |
| .ATOMSVC | Microsoft Corporation | Data Files | Atom Service Document | PSPad | Open Source |
| .ATT | Unknown Developer | Web Files | Web Form Post Data File | AbiWord | Open Source |
| .AU | Open Source | Audio Files | Audacity Audio File | Audacity | Open Source |
| .AUD | Interscape | Audio Files | Video Game Compressed Audio File | Audacity | Open Source |
| .AUF | Planit Solutions, Inc. | Font Files | Alphacam User Font | Audacity | Open Source |
| .AUG | Red Hat | System Files | Red Hat Linux Shellvars File | Linux | Open Source |
| .AUP | Open Source | Audio Files | Audacity Project Audio File | Audacity | Open Source |
| .AVA | Open Source | eBook Files | AvaaBook eBook | AvaaPlayer | Open Source |
| .AVI | Microsoft Corporation | Video Files | Audio Video Interleave File | Eltima Elmedia Player | Open Source |
| .AVS | Adobe Systems Incorporated | Data Files | Adobe Photoshop Variations File | Avisynth | Open Source |
| .AW | Microsoft Corporation | Data Files | Answer Wizard File | Free Pascal | Open Source |
| .AWK | Free Software Foundation | Developer Files | AWK Script | MacVim | Open Source |
| .AWL | Lavasoft | Settings Files | Ad-Aware Language Data | AWL Programming Language | Open Source |
| .AWT | Abisource | Text Files | AbiWord Template | AbiWord | Open Source |
| .AXD | Microsoft Corporation | Web Files | ASP.NET Web Handler File | AbiWord | Open Source |
| .AXL | Wattle Software | Data Files | XML File | AbiWord | Open Source |
| .AXS | Microsoft Corporation | Developer Files | ActiveX Script File | PSPad | Open Source |
| .AZW | Amazon | eBook Files | Amazon Kindle eBook File | Calibre | Open Source |
| .AZW3 | Amazon | eBook Files | Amazon KF8 eBook | Calibre | Open Source |
| .AZW3R | Amazon | eBook Files | Amazon KF8 eBook | Calibre | Open Source |
| .AZW4 | Amazon | eBook Files | Amazon Print Replica eBook | Calibre | Open Source |
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