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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
RRR - Extension Details
Date Added: January 01, 1970
File Extension:  .RRR
Description 1: RRR stands for Rhapzode Resource Repository. It is the extension for XML files Rhapzode uses to manage how compiled PowerPoint presentations are displayed. With the .RRR file format, authors have no problems customizing the way content is shown to viewers. RRR files feature content pointers as well as directives. Content of the presentation itself is not included in .RRR files.
Description 2: File extension .RRR is linked to backup files that contain Windows registry entries. The Registry Mechanic creates .RRR files each time the registry is optimized. Registry entries that have been taken out can be restored with the help of RRR files. To restore registry backups, click on "Restore Backup in the main program window. Restarting the computer might be necessary for the restored registry entries to load right.
File Type:   Backup file
Mode: Binary
Program(s) to Open:  Windows: PC Tools Registry Mechanic
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