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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
NCO - Extension Details
Date Added: January 01, 1970
File Extension:  .NCO
Description 1: File extension .NCO is associated with compressed backup files that Nero BackItup created. Such files contain data that are to be backed up to DVDs or CDs. Standard ZIP compression is used to compress NCO files. An NCO file may be passwordprotected as well as encrypted using 56bit key. Since the NCO files utilize ZIP compression, opening nonencrypted BackItup files is possible using various file decompression applications like Stuffit Expander and WinZip. Simply switch ".zip for ".nco and open the files.
File Type:   Backup file
Mode: Binary
Program(s) to Open:  Windows: Nero BackItUp (part of Nero 6 or later)
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