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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:
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GRP - Extension Details
Date Added: February 10, 2008
File Extension:  .GRP
Description 1: .GRP file extension is linked with Duke Nukem 3d Archive. This file carries the 3D archive file/s of Duke Nukem game application one of the three chapter series of sidescrolling platform games from Apogee Software, Ltd. .GRP file extension is also associated with Total Commander from C. Ghisler & Co., Switzerland.
Description 2: .GRP file extension is linked with StarCraft Graphic Group File which is a collection of images used for weapons, units, wireframes, spells and menu graphics within the game. Objects may contain a range of frames that can reach up to hundreds. GRP files may come from .MPQ files which can be extracted. These files can be edited using thirdparty editor aside from being referenced by the game. .GRP file extension and StarCraft are owned and developed by Blizzard Entertainment.
Description 3: .GRP file extension is linked with Windows Program Manager Group. This file identifies the group of applications listed on the Windows Start Menu [i.e. "Accessories, "Office, "Games, etc.] or other folder/s. A corrupted .GRP file can be restored into Windows default settings via Program Manager. A .GRP file may be reference by another application and it should not be manually opened. .GRP file extension and Windows Program Manager are owned and developed by Microsoft Corp.
File Type:   System File
Mode: Binary
Program(s) to Open:  Windows: Windows Program Manager Group Converter [grpconv.exe]
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