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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
RAC - Extension Details
Date Added: December 03, 2009
File Extension:  .RAC
Description 1: File extension .RAC is associated with Venue Race Application Race Description File. Venue Race Application lets users link together or connect two or more rowers with PM4s or PM3s for racing. Rooted in eRow, the program was considerably altered to specifically satisfy venue races requirements like the CRASHB races. Link indoor rowers with the help of PM4s with Ethernet cables or USB cables and hubs.
File Type:   Text file
Mode: ASCII
Program(s) to Open:  Venue Race Application Race Description File is from the company Concept2 Inc.
Common:
Extension: