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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
UU - Extension Details
Date Added: January 01, 1970
File Extension:  .UU
Description 1: The extension .UU is linked to the Uuencoded file. UU stands for "Unix to Unix encoding. Such files are encoded using the Unix uuencoded application program and come in handy when trying to convert files from binary to text file format. The conversion process helps avoid emailed files from becoming corrupted, so their recipients get them intact. .UUE is the other more common extension for these files.
File Type:   Encoded and Encrypted file
Mode: ASCII
Program(s) to Open:  Windows: Smith Micro Stuffit Deluxe, WinCode, WinZip 12 Pro Macintosh: Smith Micro Stuffit Expander, UU Undo
Common:
Extension: