| 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 |
| .PLN | Microsoft Corporation | Game Files | Flight Simulator Flight Plan |
| .9XM | Texas Instruments, Inc. | Data Files | TI Connect Data |
| .CDP | Trainz portal | Game Files | Trainz Simulator Content Dispatcher Pack |
| .ANKI | Damien Elmes | Data Files | Anki Deck Data |
| .82 | PTC | Data Files | Creo Elements/Pro Versioned Data |
| .AIL | Mystik Media | Data Files | AutoImager File |
| .QZ | PC Shareware, Inc. | Data Files | Create A Quiz Data File |
| .ZPD | Open Source | Developer Files | ABC Zeroadic Predicates |
| .RMGC | RootsMagic, Inc. | Data Files | RootsMagic V4 Genealogy Database |
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