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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
OUT - Extension Details
Date Added: January 01, 1970
File Extension:  .OUT
Description 1: File extension .OUT is associated with Pro/ENGINEER temporary file. Computer applications create such temp files for various reasons. Some are generated when programs are unable to allocate memory sufficient for their tasks while others are the result of working on data too big for the address space of the architecture. Temp files can also serve as a primitive mode of interprocess communication.
Description 2: File extension .OUT is associated with the Total Commander output file. OUT files are utilized for a number of collected files that are created from split files. Windows file manager program Total Commander is similar to Windows Explorer in that it is capable of copying, moving and/or deleting files. However, its features do not stop there. Total Commander can pack and unpack files, compare files by content, access FTP servers, handle archives like subdirectories, and more.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Use Total Commander
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