An fsform file extension is related to the form file format. Most likely some old format without support. No further information could be found.
FSFORM file extension - Form data
What is fsform file? How to open fsform files?
File type specification:
The fsform file extension is associated with the form file format.
The .fsform file is a ZIP archive that stores other binary and text files with .fdl, .fdr, .fde file extensions.
This file format seems to be obsolete, or not supported by a developer.
This fsform file type entry was marked as obsolete and no longer supported file format.
This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.