ACC - ADA
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- ACC - DR-DOS Viewmax file
- ACCDA - Data - Microsoft Access Database Wizard ( Open XML)
- ACCDB - Access 2007 Database File ( Microsoft Corporation )
- ACCDB - Access 2007 Database
- ACCDB - Microsoft Access 2007 database file
- ACCDB - Microsoft Office Access 2007 database file format
- ACCDC - Microsoft Access file
- ACCDE - Office Access 2007 files that are in execute only mode
- ACCDE - Data - Microsoft Access Database Wizard ( Open XML)
- ACCDR - Access 2007 file
- ACCDT - Microsoft Access 2007 Database Template
- ACCDT - Access Database templates
- ACCDU - Data - Microsoft Access Database Wizard ( Open XML)
- ACCESS - Unknown Apple II File
- ACCESS - Java Access Control File (Sun)
- ACCESSOR - Microsoft Visual Studio accessor file
- ACCT - Describes the format of the records in the system accounting files.
- ACD - Sonic Foundry ACID file
- ACE - ACE Archiver Compression file
- ACF - HTTP character file (Microsoft Agent)
- ACFM - Adobe Composite Font Metrics File
- ACFM - Font Metrics File
- ACG - Age of Wonders Saved Game ( Triumph Studios )
- ACG - Microsoft Agent Preview File
- ACG - Agent Preview ( Microsoft Corporation )
- ACGD - ACG System predictive model
- ACGD - ACG Case -Mix System ACG Predictive Model ( Johns Hopkins University )
- ACGI - AppleSearch CGI Interface
- ACGI - ACGI Script (WWW)
- ACGL - ACG System licence file
- ACGL - ACG Case -Mix System License File ( Johns Hopkins University )
- ACH - Medlin Accounting Automated Clearing House File ( Medlin Accounting )
- ACH - Rockwell Software Logix 5 File
- ACH - RSLogix 5 project file
- ACH - Payroll Mate 2008 Automated Clearing House File ( RealTaxTools.com)
- ACH - Speccy ZX Spectrum snapshot file
- ACI - ACI development appraisal (ACIWEB)
- ACL - Corel Draw 6 keyboard accelerator file
- ACL - List file for Microsoft Office
- ACLOCK - Amazing clock ( Amazing - Clock.com)
- ACM - Dynamic Link Library (DLL)
- ACM - Windows system directory file
- ACM - Interplay compressed sound file (Fallout 1,2, Baulder's Gate)
- ACMB - Graphics File
- ACMB - Graphics file ( ACMB format )
- ACMD - Apache Commander Project ( Zecos Software )
- ACO - ArCon project file
- ACO - Adobe color palette and swatches file
- ACO - FastTalk Acoustic Model File
- ACO - Adobe Color Palette
- ACORN - Acorn Image ( Apple Inc.)
- ACORN - Acorn draw file
- ACP - Microsoft Office Assistant Preview file
- ACQ - AcqURL bookmark manager
- ACQ - AcqURL
- ACR - American College of Radiology file
- ACROBATSECURITY - Adobe Acrobat Security Settings File
- ACROBATSECURITYSETTINGS - Adobe Acrobat Security Settings...
- ACRODATA - Acrobat Data File
- ACRS - AuthorWare File
- ACS - Character structured storage file (Microsoft Agent)
- ACSM - Adobe Content Server Message File
- ACSM - Adobe Content Server Message
- ACT - Action Presentation
- ACT - FoxPro Foxdoc Action Diagram
- ACT - Microsoft Office Assistant Actor file
- ACT! - Act!
- ACTION - MAC OS X Automator action
- ACTION - Automator Action
- ACTIONS - Defaults file
- ACTIONS - Photoline4 Defaults File
- ACTIONSCRIPT - Adobe Flash ActionScript
- ACTIVITYDIAGRAM - Microsoft Visual Studio activity diagram file
- ACTPROJ - Visual Studio.NET ACT Project ( Microsoft Corporation )
- ACU - AppleLink -PE Compression Format
- ACU - ACUCOBOL -GT Intermediate Object File ( Acucorp Inc.)
- ACU - NuFX Applelink archive
- ACV - Used to Compress and decompress audio data
- ACW - Microsoft Accessibility Wizard Settings
- ACW - Accessibility Wizard Settings ( Microsoft Corporation )
- ACW - AutoCaption Worksheet File ( Image Logic Corporation )
- ACX - Rational XDE (IBM)
- ACX - FOCUS / WebFOCUS File Description
- ACX - Atari ST Executable
- ACX - Atari ST Program
- AD - After Dark screensaver
- AD! - OzWin CompuServe File
- AD1 - Forensic Toolkit FTK Imager image file
- AD2 - ADPCM 2-bit compressed voice file - ZFAX
- AD2 - ad2 Web Page Script File (ad2 Inc.)
- AD2 - ADPCM 2-bit compressed voice file
- AD3 - Localisation Windows
- AD3 - ADHOCw file
- AD3 - ADPCM 3-bit compressed voice file ( ZFAX )
- AD3 - Compressed Voice File
- AD3D - Dimension
- AD3E - MAC file type
- AD3E - Adobe Dimensions File
- AD65 - MAC file type MAC CREATOR CODE
- Ada - Ada source text file (non-GNAT)
