| File Extension: | WK3 |
| File Type Description: | 1-2-3 Spreadsheet File |
| File Type Developer: | IBM |
| Primary Associated Software: | 1-2-3 Spreadsheet File |
| Primary Software Developer: | IBM |
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 | 1-2-3 Spreadsheet File by IBM |
| Windows 10 | Windows 11 | Windows 6 | Windows 8.1 |
 | Windows |
| Extension | File Type Developer | File Category | File Type Description |
|---|---|---|---|
| .I3I | IBM | Uncommon Files | IBM Voice Type Languages New User File |
| .U2P | IBM | Developer Files | Telelogic Tau UML Program Text File |
| .PCJ | IBM | Graphic Files | IBM LinkWay Graphics Data |
| .WR! | IBM | Spreadsheet Files | Lotus 1-2-3 Spreadsheet |
| .MAS | Image Space Incorporated | Game Files | rFactor Track File |
| .IIB | IBM | 3D Image Files | IBM Lotus Notes Data |
| .PRP | IBM | Data Files | Rational Model Properties File |
| .DGX | IBM | Data Files | IBM Rational XDE Diagram |
| .OR5 | IBM | Data Files | Lotus Organizer 5 File |
| .CLO | Pierre-Emmanuel Gougelet | Graphic Files | Cloe Ray-Tracer Image |
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