| 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 |
|---|---|---|---|
| .X50 | Jeffrey C. Johnson | Data Files | XTreeGold Help Data |
| .XCL | Jeffrey C. Johnson | Developer Files | XTree For Windows Script |
| .CMB | Jeffrey C. Johnson | Settings Files | Xtree For Windows Button Bar |
| .XTP | adnx | Data Files | xTime Project Document |
| .FUS | FXpansion Audio UK Ltd. | Uncommon Files | GURU Uninstall Script |
| .FST | Image-Line | Settings Files | FL Studio State File |
| .RDF | Unknown Developer | Settings Files | Resource Description Framework File |
| .NCP | Nikon | Settings Files | Nikon Camera Photo Settings |
| .TPL | Unknown Developer | Text Files | Document Template |
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