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The File Extension Library

What is a file extension?

Short answer: it's the set of letters after the period (.) in the name of a file.

Long answer: File extensions signify the file format of a file. It tells the operating system (OS) how data was stored in the file. Not all OS, require a file extension though. For instance, this is optional in Unix, but is mandatory with MS-DOS and Windows systems.

In most file formats the file type is actually defined by the contents (first bytes, file structure), but extensions are used to define the application that is used for opening the file.

Below is a detailed database of thousands of file extensions our team has compiled for you. Feel free to browse!


Browse all Extensions:
ABCDEFGHIJKLMNOPQRSTUVWXYZ
ACD - Extension Details
Date Added: January 01, 1970
File Extension:  .ACD
Description 1: .ACD file extension is linked with Sony ACID Pro an audio production application that contains loop references, audio tracks and other audio files used by the same project that created Sony ACID. Sonic Foundry was the original developer of ACID and Sound Forge [1998], now these are both owned by Sony Creative Software Inc.
Description 2: .ACD file extension is linked with Lingvo Dictionary file. Lingvo is a popular dictionary program in Russia due to its comprehensive, uptodate, easytouse and reliable dictionaries, as well as instant translation features. The Lingvo dictionary includes: general, specialized, professional, regional, explanatory dictionaries; thesaurus; dictionary of idioms and abbreviations; phrasebooks. Majority of these dictionaries are electronic versions of the most prominent and uptodate dictionaries in print. .ACD file extension and Lingvo are owned and developed by ABBY.
Description 3: .ACD file extension is linked with allCLEAR Flowcharting File. This is the file extension for the flowcharting file utilized/generated by allCLEAR ORGcharter a comprehensive tool for generating tree diagrams. It offers ease and speed for amending, formatting and generating diagrams [i.e. organizational charts, tournament grids, family trees, work breakdown structures, hierarchy layouts]. allCLEAR ORGcharter is owned and developed by Proquis Limited.
Description 4: .ACD file extension is linked with Chromeleon Channel Raw Data. This is the file extension for the raw data utilized/generated by Chromeleon the worlds most comprehensive chromatography software. Its key features are: provides users the complete solution for IC, GC or HPLC [for a single instrument, laboratory, enterprise or department], delivers superb flexibility, usability and capability. Chromeleon is owned and developed by Dionex Corporation.
File Type:   Data File
Mode: ASCII
Program(s) to Open:  Windows: Dionex Chromeleon
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