| 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 |
|---|---|---|---|
| .RDC | IBM | Data Files | IBM Voice Type Languages Scripts Data File |
| .M3I | IBM | Data Files | IBM Voice Type Languages Newuser File |
| .WK1 | IBM | Data Files | Lotus Worksheet |
| .DLD | Campbell Scientific | Executable Files | EdLog Compiled Program |
| .SGT | IBM | Settings Files | SPSS Chart Template File |
| .XDF | NASA | Disk Image Files | Extended Disk Format Image |
| .BOX | Unknown Developer | Data Files | E-mail Mailbox |
| .POR | IBM | Data Files | SPSS Portable File |
| .PRZ | IBM | Data Files | Freelance Graphics Presentation File |
| .SMX | MakeMusic, Inc. | Data Files | SmartMusic XML File |
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