MSS file extension is for Manuscript text file
Perfect Writer - Scribble - MINCE - Jove
Similar to MSS
A2A - APLASCII EISPACK file
A2A - IBM Voice Type Language Vocabels File
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
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