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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
THM - Extension Details
Date Added: January 01, 1970
File Extension:  .THM
Description 1: File extension .THM is associated with Thumbnail Image File. THM files contain tiny, iconsized images that are utilized in representing larger images. This type of file is often seen used in clip art galleries or on the Internet. Create THM files with the help of various video or photoediting software programs. A number of digital cameras produce these files as small image samples of saved photos on the said cameras.
File Type:   Raster Image file
Mode: Binary
Program(s) to Open:  Windows: ACD Systems ACDSee, Microsoft Picture and Fax Viewer, other image viewers Macintosh: Apple Preview, other image viewers
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