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| Extension | Information |
| ACMB | Graphics File |
| ACMD | Apache Commander Project (Zecos Software) |
| ACO | Photoshop Color Swatch File (Adobe) Fast-Talk Acoustic Model File (Fast-Talk Communications, Inc.) ArCon Project (TRIXL GmbH) |
| ACP | ACB Compressed File Archive |
| ACP | Acrobat Paper Capture Temporary File (Adobe) Office Assistant Preview File (Microsoft) |
| ACQ | AcqURL |
| ACR | American College of Radiology Dicom |
| ACS | Agent Character (Microsoft) |
| ACT | Action! Presentation Animation:Master Action (Hash) DataWave Physiological Data File FoxPro Documenting Wizard Action Diagram (Microsoft) Office Actor Program File (Microsoft) Photoshop Color Table (Adobe) ADPCM Compressed File Recorded by Some MP3 Players/Voice Recorders Train Simulator Activity File (Microsoft) |
| ACTIONS | Photoline4 Defaults File |
| ACTPROJ | Visual Studio .NET ACT Project (Microsoft) |
| ACU | AppleLink-PE Compression Format COBOL Intermediate Object File |
| ACV | OS/2 Audio Drivers Photoshop Saved Curve (Adobe) |
| ACW | Accessibility Wizard Settings (Microsoft) American Civil War Game Save File (Interactive Magic) AutoCaption Worksheet File (Image Logic Corporation) |
| ACX | Atari ST Executable FOCUS/WebFOCUS File Description Rational XDE (IBM) |
| AC_ | CaseWare Working Papers Compressed Client File Creativ compressed Sb16 sbide file |
| AD | After Dark Screen Saver Ascend Password Protocol |
| AD! | OzWin CompuServe E-mail/Forum Access QS-Special - Get Marked Online |
| AD2 | Compressed Voice File |
| AD3 | Compressed Voice File |
| ADA | ActiveDocs Answer Set ADA Program Advanced Digital Audio Compressed Audio |
| 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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