 Acer File Extensions |
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| AQ | Applix Data |
| ARA | ATI Radeon Video Driver File |
| ARC | LH ARC Compressed File |
| ARC | Archive File |
| ARF | Automatic Response File |
| ARI | Aristotle Audio File |
| ARI | Compressed Archive |
| ARJ | Robert Jung ARJ Compressed Archive |
| ARK | Compressed Archive |
| ARL | AOL Organizer File |
| ARQ | Compressed Archive |
| ARR | Atari Cubase Arrangement |
| ART | Xara Studio Drawing |
| ART | First Publisher Raster Graphic |
| ART | Canon Crayola Art File |
| ART | Clip Art File Format |
| ART | Another Ray Tracer Format |
| ART | AOL Johnson-Grace Compressed File |
| ART | Archive (various games, including Blood and Duke Nukem 3D) |
| ARV | AutoRoute User Information |
| ARX | Compressed Archive |
| ARY | Compaq SmartStart Scripting Toolkit File |
| AS | Applix Spreadsheet |
| AS | Macromedia Flash Action Script |
| ASA | Microsoft Visual InterDev File |
| ASA | Active Server Document |
| ASB | Atari ST picture |
| ASC | ASCII Text File |
| ASC | PGP Armored Encrypted File |
| ASD | Microsoft Advanced Streaming Format Description File |
| ASD | MS Word Automatic Backup |
| ASD | Lotus Screen Driver |
| ASD | Astound Presentation |
| ASE | Velvet Studio Sample |
| ASF | StatGraphics Data |
| ASF | MS Active Streaming (Media) File |
| ASF | Lotus Screen Font |
| ASF | APL*Plus/PC APL Shared File |
| ASF | Electronic Arts Music File |
| ASH | Borland TASM Assembler Header |
| ASI | Borland TASM Assembly language Include |
| ASK | askSam Database |
| ASM | Assembler Source Language (various) |
| ASO | Astound Dynamite Objects |
| ASO | Assembler Object |
| ASP | Active Server Page |
| ASP | Procomm Plus Setup and Connection Script |
| ASP | Astound Presentation File |
| ASP | Photoshop Photo File Index |
| ASP | Photoshop Separation Setup |
| ASR | MS Automap Route |
| ASR | Photoshop Scratch Area |
| AST | Astound Multimedia File |
| AST | Photoshop Separation Tables |
| AST | Claris Works Assistant File |
| ASV | DataCAD Autosave File |
| ASV | Photoshop Selective Colour |
| ASX | Cheyenne Backup Script |
| ASX | MS Windows Media Active Stream Redirector File |
| ASX | Video File |
| AT2 | Aldus Persuasion 2.0 Auto Template |
| ATD | Microsoft Systems Management Server SMSADDIN.EXE tool registration |
| ATF | Photoshop Transfer Function |
| ATM | Adobe Type Manager Data File |
| ATN | Adobe Photoshop Action File |
| ATR | Lightscape Material Library |
| ATT | AT&T Group 4 Bitmap |
| ATW | AnyTime Deluxe PIM File |
| ATX | Compressed Archive |
| ATY | 3D Topicscape association type after export to Windows (More Info) |
| AU | Music File (various) |
| AUD | Audio File used by Westwood Studios for various games |
| AUT | AutoIt Script |
| AUT | Signwave Auto-Illustrator File |
| AUT | Descent Manager Mission File |
| AUT | Authentication File (various) |
| AUT | Interactive Pictures iPIX Format |
| AUX | X/LaTeX Auxilliary Reference File |
| AUX | ChiWriter Auxilliary Dictionary File |
| AVA | Avagio Publication |
| AVB | Microsoft Chat Character File |
| AVB | Inculan Anti-Virus Virus Infected File |
| AVD | Avery Label Pro Data File |
| AVI | Audio Video Interleave File |
| AVR | Audio Visual Research Sound File |
| AVS | Application Visualisation System Format |
| AVS | Animation File |
| AVS | Stardent AVS-X Image |
| AVS | Winamp Advanced Visualization Studio File |
| AW | Answer Wizard for Microsoft Help Files |
| AW | Hewlett-Packard Advance Write document |
| AW | Applix Word File |
| AWD | Faxviewer Document |
| AWD | Award BIOS File |
| AWE | Adobe Acrobat Bookmark XML File |
| AWF | Archive (Who Wants to be a Millionaire) |
| AWK | AWK Programming Language Script |
| AWM | Animation Works Movie |
| AWP | Microsoft Fax Key Viewer |
| AWR | Telsis Digital Audio File |
| AWS | Microsoft Fax Document, Fax Signature |
| AWS | StatGraphics Data File |
| AWX | Fax Document |
| AWX | ArcIMS XML Project File |
| AWX | Custom AppWizard |
| AWX | MS DirectX 8.1 |
| AX | DivX MPEG-4 DVD Filter |
| AX | DirectShow Filter |
| AXD | Avery Label Pro Re-Index File |
| AXE | MS Autoroute Export File |
| AXG | MS Autoroute Trip File |
| AXI | Axiom Composite File Management System clipart (MetaToolsFile Kai's Power Goo Picture Library) |
| AXR | Telsis Digital Audio File |
| AXS | ActiveX Script HTML |
| AXT | ASCII Application Object Template |
| AXT | Photoshop Replace Colour/Colour Range |
| AZ | WinDVD File |
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