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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .WG1 | IBM | Spreadsheet Files | Lotus 1-2-3 Worksheet File | Lotus 1-2-3 | IBM |
| .WG2 | IBM | Data Files | IBM Lotus 1-2-3 File | Lotus 1-2-3 | IBM |
| .WJ3 | IBM | Spreadsheet Files | Lotus 1-2-3 Worksheet File | Lotus 1-2-3 | IBM |
| .WK! | IBM | Spreadsheet Files | Lotus 1-2-3 Spreadsheet | Lotus 1-2-3 | IBM |
| .WK1 | IBM | Data Files | Lotus Worksheet | Lotus 1-2-3 | IBM |
| .WK4 | IBM | Data Files | Lotus Lotus 1-2-3 V4 Worksheet | Lotus 1-2-3 | IBM |
| .WKE | IBM | Spreadsheet Files | Lotus 1-2-3 Educational Version Worksheet | Lotus 1-2-3 | IBM |
| .WR! | IBM | Spreadsheet Files | Lotus 1-2-3 Spreadsheet | Lotus 1-2-3 | IBM |
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