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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
JPM - Extension Details
Date Added: January 12, 2008
File Extension:  .JPM
Description 1: .JPM file extension is linked with JPEG 2000 JPM File Format. This is the format developed by JPEG [Joint Photographic Experts Group] to provide document imaging. .JPM files carry layered still images which utilize JPEG 2000 and added encodings. The file format utilizes a composting model based on the Mixed Raster Content standard [ISO/IEC 16485].
File Type:   Bitmap Image File
Mode: Binary
Program(s) to Open:  Windows & Mac: any program that supports document imaging
Common:
Extension: