| File Extension: | GRR |
| File Type Description: | Gradekeeper Class Roster Data |
| File Type Developer: | Daniel Ethier |
| Primary Associated Software: | Gradekeeper |
| Primary Software Developer: | Daniel Ethier |
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Gradekeeper Class Roster Data files are the most popular type of files to carry the GRR file extension, originally developed by Daniel Ethier for Gradekeeper. Commonly, Gradekeeper Class Roster Data files are found on user computers from United States, and on PCs running the Windows 10 operating system. Most of these users are running the Google Chrome web browser.
 | Gradekeeper by Daniel Ethier |
| Windows 10 | Windows 11 | Windows 6 | Windows 8.1 |
 | Windows |
 | Mac |
| Extension | File Type Developer | File Category | File Type Description |
|---|---|---|---|
| .GRK | Daniel Ethier | Data Files | Gradekeeper Class Gradebook File |
| .PTS | Avid Technology | Audio Files | Pro Tools Session |
| .GIL | Unknown Developer | Data Files | GILS Document |
| .AUDIO | Apple | Data Files | Golden Orchard Apple II CD Rom File |
| .SSP | Scala | Web Files | Scala Server Page |
| .JPF | Joint Photographic Experts Group | Raster Image Files | JPEG 2000 Image |
| .DDW | Dream Design Entertainment Software | Data Files | GLBasic World File |
| .TVC | IMSI/Design, LLC | Settings Files | Turbo View & Convert Batch Presets File |
| .CURVE | Apple | Data Files | Golden Orchard Apple II CD Rom File |
| .3PM.8 | Apple | Data Files | Apple MacOS (OS X) Data |
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