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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .A00 | Robert K. Jung | Compressed Files | Split Multi-volume ARJ Compressed File Archive | WinZip | Corel |
| .A01 | Robert K. Jung | Compressed Files | Split Multi-volume ARJ Compressed File Archive | WinZip | Corel |
| .A02 | Robert K. Jung | Compressed Files | Split Multi-volume ARJ Compressed File Archive | WinZip | Corel |
| .A03 | Robert K. Jung | Compressed Files | Split Multi-volume ARJ Compressed File Archive | WinZip | Corel |
| .A04 | Robert K. Jung | Compressed Files | Split Multi-volume ARJ Compressed File Archive | WinZip | Corel |
| .A05 | Robert K. Jung | Compressed Files | Split Multi-volume ARJ Compressed File Archive | WinZip | Corel |
| .A06 | Robert K. Jung | Compressed Files | Split Multi-volume ARJ Compressed File Archive | WinZip | Corel |
| .A07 | Robert K. Jung | Compressed Files | Split Multi-volume ARJ Compressed File Archive | WinZip | Corel |
| .A08 | Robert K. Jung | Compressed Files | Split Multi-volume ARJ Compressed File Archive | WinZip | Corel |
| .A09 | Robert K. Jung | Compressed Files | Split Multi-volume ARJ Compressed File Archive | WinZip | Corel |
| .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 | WinZip | Corel |
| .A11 | Robert K. Jung | Compressed Files | Split Multi-volume ARJ Compressed File Archive | WinZip | Corel |
| .A32 | Robert K. Jung | Compressed Files | Split Multi-volume ARJ Compressed File Archive | WinZip | Corel |
| .ACE | e-merge GmbH | Compressed Files | WinAce Compressed File | WinRAR | Eugene Roshal |
| .ADSM | Nikolas Ehrenberg | Compressed Files | Advanced Split Machine Split File | Advanced Split Machine | Nikolas Ehrenberg |
| .AFA | Fantiusen Software | Compressed Files | Astrotite Compressed Archive | Astrotite | Fantiusen Software |
| .AGG | New World Computing | Compressed Files | Bulk Data File | Heroes of Might & Magic III | Ubisoft |
| .AGL | Oracle Corporation | Compressed Files | Agile XML Archive | Agile Product Lifecycle Management | Oracle Corporation |
| .AIN | Valve | Compressed Files | Source Engine Compiled AI Nodegraph File | Valve Source SDK | Valve |
| .AK | Unknown Developer | Compressed Files | Audio Utility Tuningwrench Compressed File | Unknown Software | Unknown Developer |
| .ALZ | ESTsoft | Compressed Files | ALZip Archive | The Unarchiver | Dag Agren, Circlesoft |
| .APK | Compressed Files | Android Package File | Google Android SDK | ||
| .APPXBUNDLE | Microsoft Corporation | Compressed Files | Microsoft Windows App Bundle Package | Microsoft Visual Studio | Microsoft Corporation |
| .APZ | Indigo Rose | Compressed Files | Autoplay Media Studio Exported Project | AutoPlay Media Studio | Indigo Rose |
| .AR | Microsoft Corporation | Compressed Files | Midtown Madness Data File | 7-Zip | Igor Pavlov |
| .ARA | Open Source | Compressed Files | Archivaldo Resource Archive | Archivaldo | Open Source |
| .ARC | Symantec Corporation | Compressed Files | Norton Backup Archive | Symantec Norton 360 Version 6.0 | Symantec Corporation |
| .ARH | Siemens AG | Compressed Files | ProTool Compressed Project File | Siemens ProTool | Siemens AG |
| .ARI | ARRI Group | Compressed Files | ARRIRAW Image | Microsoft Windows Photos | Microsoft Corporation |
| .ARJ | Robert K. Jung | Compressed Files | ARJ Compressed File Archive | 7-Zip | Igor Pavlov |
| .ARK | Avanquest Software | Compressed Files | PowerDesk Pro Archive | FreeArc | Bulat Ziganshin |
| .ASR | Adobe Systems Incorporated | Compressed Files | ActionScript Remote Document | Adobe Dreamweaver | Adobe Systems Incorporated |
| .AW | Microsoft Corporation | Compressed Files | Answer Wizard File | Microsoft Excel | Microsoft Corporation |
| .AW_ | Unknown Developer | Compressed Files | Midiprg Quartz Sets Compressed File | Unknown Software | Unknown Developer |
| .AZA | Unknown Developer | Compressed Files | QazaR Archive Compressed File | QazaR | Unknown Developer |
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