| 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 Japan 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 |
|---|---|---|---|
| .MLB | Avanquest Software | Data Files | MyLabel Designer Deluxe Project File |
| .16 | Ubisoft | Game Files | Salt Lake Winter Olympics 2002 Game Music File |
| .MSG | Microsoft Corporation | Text Files | Saved Email Message |
| .LWD | EditShare | Data Files | Lightworks Data File |
| .GRA | Microsoft Corporation | Data Files | Microsoft Graph File |
| .AIO | IBM | Developer Files | APL Transfer Format File |
| .PLI | IBM | Developer Files | PL/I Source Code File |
| .COL | Open Source | Data Files | Bibexcel File |
| .TJF | Hewlett-Packard | Backup Files | VAXTPU Backup |
| .BOS | IBM | Developer Files | Build Options Specification File |
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