FileInfo.com


.GRP File Extension


File Type 1 Windows Program Manager Group  (Most common)
File Format File
Common? No
File Description Defines a group of programs listed in the Windows Start Menu; i.e. "Main," "Games," "Accessories," or other folder.

If a GRP file becomes corrupt, you can restore it to Windows default settings by using the Program Manager; select File->Run, then type "setup /p" and press Enter; this will rebuild the GRP file using Windows default settings.
Program(s) that open grp files Windows: Windows Program Manager Group Converter (grpconv.exe)

File Type 2 StarCraft Graphics Group File
File Format Proprietary File
Common? No
File Description Collection of frame images used for units, weapons, spells, wireframes, and menu graphics within Starcraft; each object may contain anywhere from a few to several hundred frames.

GRP files may be extracted from the .MPQ file; they are referenced by StarCraft, but can be edited with a third-party editor.
Program(s) that open grp files Mac: Referenced by Blizzard StarCraft
Windows: Referenced by Blizzard StarCraft; Edit with RetroAcive RetroGRP

Information from FileInfo.com - The File Extensions Resource.
http://www.fileinfo.com/extension/grp