FPSC was actually made and written (almost) entirely in DarkBASIC Professional.
The problem with the TEMP folder data, is one that stands with DBP.
The way it works, is that DBP unloads required DLL's from it's exe into these directories and reads them back into memory from there. Why, I don't know, but it's known throughout the DBP community.
Deleting the folder will not effect anything to do with FPSC ( as long as FPSC isn't open when you try to delete them ).
Save, do back-ups of the saves, then delete.
I'm not taking any responsibility if you lose anything, though
Jess.