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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
STT - Extension Details
Date Added: January 01, 1970
File Extension:  .STT
Description 1: .STT is associated with the Streets & Trips Map Template file. Use this extension to save map templates with Microsoft Streets & Maps, the consumeroriented map and travel program. STT files serve as a takeoff point in custom maps (.EST files) creation. Such files might include basic map settings along with legends, routes, symbols and other info.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Windows: Microsoft Streets & Strips
Common:
Extension: