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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
RPGM - Extension Details
Date Added: January 01, 1970
File Extension:  .RPGM
Description 1: .RPGM is the extension tied to the Portable greyscale image. It is attached to PBMPlus files that Jef Poskanzers PBMPlus Portable bitmap utilities creates. The portable gray map file format features the lowest common denominator grayscale file format. .RPGM files are associated with the XnView application from developer Pierre.e Gougelet. XnView is a program to view and convert graphic files.
File Type:   Bitmap Image file
Mode: Binary
Program(s) to Open:  Associated application: XnView
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