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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
ACGL - Extension Details
Date Added: January 01, 1970
File Extension:  .ACGL
Description 1: .ACGL file extension is linked with ACG System License File. This is the file extension for the license file utilized/generated by ACG System an application that measures the morbidity burden of patient population based on their disease patterns, gender and age. It uses diagnostic code info that is found in hospital and professional insurance claims or other computerized records. It creates common language for healthcare analysis which benefits healthcare purchasers, providers and consumers. ACG System is owned and developed by Johns Hopkins University.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Windows: ACG System
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