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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
HTT - Extension Details
Date Added: January 01, 1970
File Extension:  .HTT
Description 1: .HTT file extension is linked with Hypertext Template File. This is the hypertext file which is utilized for identifying particular settings in Windows. "Folder.htt carries HTML code which customizes the display methods of folder contents [i.e. scripts that access and display info from Filelist control]. .HTT file includes the following info: style settings, FormatNumber function, FixSize function, Init function, OnThumbnailReady event, SelectionChanged event, Normal Banner DIV, Minibanner DIV, FileList Object tag, Left Info Panel DIV.
File Type:   System File
Mode: Binary
Program(s) to Open:  Windows: referenced by Windows OS
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