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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .123 | IBM | Spreadsheet Files | Lotus 1-2-3 Spreadsheet | Lotus 1-2-3 | IBM |
| .ADN | Microsoft Corporation | Database Files | Access Blank Project Template | Lotus 1-2-3 | IBM |
| .APC | Savvius, Inc. | Data Files | AiroPeek Wireless Trace Capture File | Lotus 1-2-3 | IBM |
| .DLD | Campbell Scientific | Executable Files | EdLog Compiled Program | Lotus 1-2-3 | IBM |
| .DVC | IBM | Data Files | Lotus 1-2-3 Data | Lotus 1-2-3 | IBM |
| .FMT | Microsoft Corporation | Settings Files | FoxPro Format File | Lotus 1-2-3 | IBM |
| .IMP | Lotus Software | Spreadsheet Files | Improv Spreadsheet File | Lotus 1-2-3 | IBM |
| .LBR | Dag Agren, Circlesoft | Compressed Files | LU Library Archive | Lotus 1-2-3 | IBM |
| .LWD | EditShare | Data Files | Lightworks Data File | Lotus 1-2-3 | IBM |
| .PFL | PlotSoft | Page Layout Files | PDFill Project File | Lotus 1-2-3 | IBM |
| .PRN | Various Developers | Page Layout Files | HP PCL Printer Output | Lotus 1-2-3 | IBM |
| .RI | IBM | Data Files | IBM Lotus 1-2-3 File | Lotus 1-2-3 | IBM |
| .SMI | Apple | Disk Image Files | Self-Mounting Disk Image | Lotus 1-2-3 | IBM |
| .TMD | SoftMaker Software | Text Files | TextMaker Document | Lotus 1-2-3 | IBM |
| .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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