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| Extension | Information |
| AC$ | AutoCAD Undo Info (Autodesk) |
| AC1 | Weaver Spider Software (Weaver Spider Software) |
| AC3 | AC3 Audio File Format |
| ACA | Agent Character (Microsoft) |
| ACA | Project Manager Workbench File |
| ACAD | AutoCAD Database (Autodesk) |
| ACB | ACMB Graphic Image AOL Cab Launcher (AOL) Photoshop Color Book (Adobe) |
| ACC | Atari ST Executable Composer File (Microsoft) DR-DOS Viewmax File Graphic Accounts Accounts Data (FKJ Software) |
| ACD | Agent Character Definition (Microsoft) ALAN Game allCLEAR Flowcharting File Chromeleon Channel Raw Data Nascar Racing 2002 Arcade Car Setup (Sierra) Sonic Foundry Acid Music File (Sony) RSLogix 5000 Project File (Rockwell Automation) |
| ACE | Aces200 WinAce Compressed File (e-merge GmbH) Casting Electronic Enterprise CV Archive (Casting Electronic) Jupiter Ace Snapshot |
| ACF | Agent Character (Microsoft) DB/TextWorks Database Access Control File Photoshop Custom Filter (Adobe) X-Plane Plane Description File (Laminar Research) AdviceCalculator (JRK Software) |
| ACG | Agent Preview (Microsoft) Age of Wonders Saved Game (Triumph Studios) |
| ACGI | AppleSearch CGI Interface |
| ACH | Rockwell Software Logix 5 File Speccy Snapshot |
| ACI | ACI Development Appraisal |
| ACL | Access Control List (Microsoft) ACL For Windows Corel Draw 6 Keyboard Accelerator Office AutoCorrect List (Microsoft) RaidenFTPD Rights File |
| ACM | ACBM Image File Audio Compression Manager Driver (Microsoft) Infinity Game Engine Sound Interplay Compressed Sound File Movie File in some games Photoshop Command Button (Adobe) Windows System File American Civil War File (Interactive Magic) |
| File Extensions beginning with the letter A broken down by page: | ||||
| File Extensions: a through a4l |
File Extensions: a4m through abap |
File Extensions: abc through ac |
File Extensions: ac$ through acm |
File Extensions: acmb through ada |
| File Extensions: adb through adm |
File Extensions: adn through aeg |
File Extensions: aeh through afp |
File Extensions: afs through ai |
File Extensions: ai3 through ajp |
| File Extensions: ajz through all |
File Extensions: alm through amf |
File Extensions: amff through ani |
File Extensions: anim through apd |
File Extensions: ape through app |
| File Extensions: appt through archimedes |
File Extensions: ard through art |
File Extensions: arv through asl |
File Extensions: asm through asx |
File Extensions: asy through atw |
| File Extensions: atx through avl |
File Extensions: avm through a_t |
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