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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .PR1 | CheckMark Inc | Data Files | CheckMark Payroll Software Employees File | CheckMark Payroll | CheckMark Inc |
| .PR2 | dBase, LLC | Developer Files | dBASE IV Printer Driver | CheckMark Payroll | CheckMark Inc |
| .PR3 | Adobe Systems Incorporated | Page Layout Files | Adobe Persuasion V3 Presentation | CheckMark Payroll | CheckMark Inc |
| .PR4 | Software Publishing Corporation (SPC) | Data Files | Harvard Graphics Presentation | CheckMark Payroll | CheckMark Inc |
| .PR5 | GEOTOP | GIS Files | MapSys Map File | CheckMark Payroll | CheckMark Inc |
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