12M file extension is for Lotus123 Smartmaster file




Similar to 12M

A2A - Sharp APL Workspace Export File
A2B - A2B Player Playlist
A2M - AudioToMidi Settings file
A3 - Unrelated Inventions Audiotools Show Log
A3D - Amapi 3D Modeling File
A3K - Yamaha A3000 Sampler File
A3L - Authorware Version 3.x Library

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