.FSM File Extension
File Type 1FreeSpace Mission File
What is an FSM file?
Contains game data for "Descent: FreeSpace — The Great War," a space combat simulation game released in 1998; stores progress of a specific mission; can be opened with FreeSpace or edited using FRED, the FreeSpace Editor.
File Type 2Farandole Composer WaveSample File
.FSM File Association 2
Sample format used by Farandole Composer, an older music tracking program
File Type 3Splitty Master Split File
.FSM File Association 3
Master file of a split archive created with Splitty, a file splitter optimized for speed, security, and efficiency; stores information about the split archive and the .FSS data files that make up the archive.