| File Extension: | 123 |
| File Type Description: | Lotus 1-2-3 Spreadsheet |
| File Type Developer: | IBM |
| Primary Associated Software: | Apache OpenOffice |
| Primary Software Developer: | Apache Software Foundation |
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Open Source developed the 123 file extension, also know as a Lotus 1-2-3 Spreadsheet file, for the Gnumeric software package. Annoymous user data statistics infer that 123 files are most popular in United States and with those using Windows 10 devices. A high percentage of these users browse the web using Google Chrome.
 | NeoOffice by Planamesa Software Inc. |
 | PCB123 by Sunstone Circuits |
 | Lotus 1-2-3 by IBM |
 | Apache OpenOffice by Apache Software Foundation |
 | Gnumeric by Open Source |
| Windows 10 | Windows 11 | Windows 6 | Windows 8.1 |
 | Windows |
 | Mac |
 | Android |
 | Linux |
| Extension | File Type Developer | File Category | File Type Description |
|---|---|---|---|
| .WR! | IBM | Spreadsheet Files | Lotus 1-2-3 Spreadsheet |
| .WK! | IBM | Spreadsheet Files | Lotus 1-2-3 Spreadsheet |
| .OTS | Apache Software Foundation | Spreadsheet Files | OpenDocument Spreadsheet Template |
| .PAR | Siemens PLM Software | CAD Files | Solid Edge Part File |
| .SMF | Oracle Corporation | Text Files | StarMath Formula File |
| .MET | Emulex Corporation | Data Files | eMule Resource File |
| .SKI | Motorola | Settings Files | Motorola Phone Skin File |
| .DPC | Microsoft Corporation | Data Files | Microsoft Office Resource File |
| .DIF | Microsoft Corporation | Data Files | Data Interchange Format |
| .ODS | Oracle Corporation | Spreadsheet Files | OpenDocument Spreadsheet |
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