| File Extension: | FAFF |
| File Type Description: | Professional Calc Spreadsheet File |
| File Type Developer: | Unknown Developer |
| Primary Associated Software: | Professional Calc |
| Primary Software Developer: | Unknown Developer |
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Professional Calc is the primary software program that utilizes the Professional Calc Spreadsheet File file, originally developed by Unknown Developer. Commonly, Professional Calc Spreadsheet File files are found on user computers from Japan, and on PCs running the Windows 10 operating system. Statisically, these users are most likely running the Google Chrome internet browser.
 | Professional Calc by Unknown Developer |
| Windows 10 | Windows 11 | Windows 6 | Windows 8.1 |
 | Amiga |
| Extension | File Type Developer | File Category | File Type Description |
|---|---|---|---|
| .BKT | Zortech | Uncommon Files | Zortech Data File |
| .IT3 | Unknown Developer | Data Files | Internet Timer 3 Log |
| .REUNION | Apple | Data Files | Golden Orchard Apple II CD Rom File |
| .REP?FB_XD_FRAGMENT= | Unknown Developer | Uncommon Files | Unknown File Type |
| .DNA.XML | Unknown Developer | Uncommon Files | Unknown File Type |
| .UK_ | Unknown Developer | Uncommon Files | Mcguiness File |
| .CGB | Unknown Developer | Data Files | Gameboy Color Data |
| .VOICE | Apple | Data Files | Golden Orchard Apple II CD Rom File |
| .MLTV | Apple | Data Files | Golden Orchard Apple II CD Rom File |
| .KXM | Unknown Developer | Uncommon Files | Uncommon File Extension |
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