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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
THEME - Extension Details
Date Added: January 01, 1970
File Extension:  .THEME
Description 1: File extension .THEME refers to theme files for Windows having the operating system software enhancement called Windows Plus!. THEME files contain colors and images along with other settings that are useful for customizing the Windows desktop. The .THEME file may come included with the Windows Plus! Program or be custommade by users. Microsoft Plus! Was the first Plus! package developed for Windows 95. The creation of enhancement software came later, for Windows 98 and XP.
File Type:   System file
Mode: Binary
Program(s) to Open:  Windows: Microsoft Plus! for Windows 95/98/XP
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