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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
XRP - Extension Details
Date Added: July 01, 2009
File Extension:  .XRP
Description 1: File extension .XRP is attached to plans created with the project management software called RationalPlan. XRP files are used to track projectrelated info like workload, costs, resources, costs as well as budget management. The XRP files may come in a Single Project or MultiProject file (generated with the RationalPlan Multi Project). View the files with the help of the RationalPlan Project Viewer freeware.
File Type:   Data file
Mode: ASCII
Program(s) to Open:  Mac, Windows and Unix: Stand By Soft RationalPlan
Common:
Extension: