| File Extension: | PFK |
| File Type Description: | XTree Programmable Function Keys |
| File Type Developer: | Jeffrey C. Johnson |
| Primary Associated Software: | XTree |
| Primary Software Developer: | Jeffrey C. Johnson |
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Jeffrey C. Johnson developed the PFK file extension, also know as a XTree Programmable Function Keys file, for the XTree software package. Our internal web tracking data indicates that Windows 10 operating system users, and those living in United States, are the most likely to use XTree Programmable Function Keys files. Google Chrome is their primary internet browser for the bulk of these users.
 | XTree by Jeffrey C. Johnson |
| Windows 10 | Windows 11 | Windows 6 | Windows 8.1 |
 | Windows |
 | DOS |
| Extension | File Type Developer | File Category | File Type Description |
|---|---|---|---|
| .CMB | Jeffrey C. Johnson | Settings Files | Xtree For Windows Button Bar |
| .XCL | Jeffrey C. Johnson | Developer Files | XTree For Windows Script |
| .X50 | Jeffrey C. Johnson | Data Files | XTreeGold Help Data |
| .XTP | adnx | Data Files | xTime Project Document |
| .WWK | Corel Corporation | Settings Files | Corel WordPerfect Keyboard Layout File |
| .SGT | IBM | Settings Files | SPSS Chart Template File |
| .FVP | Unknown Developer | Settings Files | File Viewer Plus Batch Presets File |
| .RDW | Mediachance | Settings Files | Real-DRAW Project File |
| .TF | Borland | Settings Files | Turbo Profiler Configuration |
| .FAT | Open Source | Settings Files | Zinf Theme File |
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