| 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 China 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 |
|---|---|---|---|
| .MVR | IBM | Web Files | IBM HotMedia Multimedia File |
| .L2L | IBM | Uncommon Files | IBM Voice Type Languages Addword File |
| .PRZ | IBM | Data Files | Freelance Graphics Presentation File |
| .OR4 | IBM | Data Files | IBM Lotus Organizer 97 GS File |
| .IRL | IBM | Settings Files | IBM WebSphere ILOG JRules Rule File |
| .BDK | IBM | Disk Image Files | OS/2 Floppy Disk Image |
| .RI | IBM | Data Files | IBM Lotus 1-2-3 File |
| .4GE | IBM | Developer Files | IBM Informix 4GL Compiled Source Code |
| .GDF | Eytan Adar | Data Files | GUESS Graph Data Format File |
| .APX | Ability Plus Software | Raster Image Files | Ability Photopaint Studio Image |
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