Common Data Files
| Extension | File Description |
| .123 | Lotus 1-2-3 Spreadsheet |
| .csv | Comma Separated Values |
| .dat | Data File |
| .db | Database File |
| .dll | Dynamic Link Library |
| .fpt | FileMaker Pro File |
| .mdb | Microsoft Access Database |
| .sql | Structured Query Language Data |
| .wks | Microsoft Works Spreadsheet |
| .xls | Microsoft Excel Spreadsheet |
| .xml | Extensible Markup Language File |