| File Extension: | 12M |
| File Type Description: | Lotus 1-2-3 SmartMaster File |
| File Type Developer: | IBM |
| Primary Associated Software: | IBM Collaboration Solutions |
| Primary Software Developer: | IBM |
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Lotus 1-2-3 SmartMaster File files are the most popular type of files to carry the 12M file extension, originally developed by IBM for IBM Collaboration Solutions. Our data shows that 12M files are frequently utilized by PC users in United States and popular on the Windows 10 platform. In most cases, these users are surfing the internet using the Google Chrome browser.
 | IBM Collaboration Solutions by IBM |
| Windows 10 | Windows 11 | Windows 6 | Windows 8.1 |
 | Windows |
| Extension | File Type Developer | File Category | File Type Description |
|---|---|---|---|
| .QPR | Microsoft Corporation | Developer Files | FoxPro Generated Query Program |
| .13 | IBM | Data Files | IBM Voice Type Languages Scripts Data File |
| .APX | Ability Plus Software | Raster Image Files | Ability Photopaint Studio Image |
| .GRA | Microsoft Corporation | Data Files | Microsoft Graph File |
| .17 | IBM | Data Files | IBM Voice Type Languages Scripts Data File |
| .RDC | IBM | Data Files | IBM Voice Type Languages Scripts Data File |
| .WK4 | IBM | Data Files | Lotus Lotus 1-2-3 V4 Worksheet |
| .P2C | IBM | Data Files | IBM Voice Type Languages Newuser File |
| .GDF | Eytan Adar | Data Files | GUESS Graph Data Format File |
| .PKX | IBM | Data Files | Rational XDE Data |
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