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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
IM - Extension Details
Date Added: January 01, 1970
File Extension:  .IM
Description 1: .IM file extension is linked with Sun Raster Grey Bitmap Graphics File. This is the file extension for raster grey bitmap graphics utilized by SunOS a version of UNIX OS developed by Sun Microsystems for their workstations and servers. SunOS only refers to version 1.o to 4.1.4, and they are based on BSD Unix. SunOS 5.0 and later versions are based on UNIX system ver. 4, and they are marketed under the Solaris brand.
File Type:   Bitmap Image File
Mode: Binary
Program(s) to Open:  Unix: SunOS
Common:
Extension: