Fm extension is associated with FileMaker Pro Document. You can try to open fm files with File Maker software.
These are the documents which created by FileMaker or FileMaker Pro. The file type of the new versions was changed as .fmp.
FrameMaker : Framemaker software which is an Adobe product keeps file with this format.
To get detailed information about filemaker or framemaker software, please check the following links.
What to use fm
File Maker or File Maker alternatives
which page related to fm file
fm Related Searches
You can check related links about fm fileextension.