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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
RPBM - Extension Details
Date Added: January 01, 1970
File Extension:  .RPBM
Description 1: File extension .RPBM is associated with the Portable Bitmap image format. Jef Poskanzers PBMPlus Portable Bitmap Utilities creates PBMPlus files. This portable bitmap format represents the lowest common denominator monochrome file format. It was designed primarily for making mailing bitmaps between various machinetypes using todays typical stupid network mailers reasonable. At present, this file acts as the common language of a large bitmap conversion filters family.
File Type:   Bitmap Image file
Mode: Binary
Program(s) to Open:  Associated application: XnView from Pierre.e Gougelet
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