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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
PAG - Extension Details
Date Added: January 01, 1970
File Extension:  .PAG
Description 1: File extension .PAG refers ActivePerl Pro Studio hash. Hash functions are any welldefined mathematical functions or procedures converting large, usually differentsized data amounts into a small datum, often one integer that serves as an index into a particular array. Values returned by hash functions are called hash codes, hash sums, hash values, or just simply hashes. Hash functions hasten data comparison and/or table lookup tasks like similar or duplicated records detection in large files, similar stretches location in DNA sequences, database items searches, and more.
File Type:   Database file
Mode: Binary
Program(s) to Open:  Associated application: ActivePerl Pro Studio by ActiveState Software
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