fff extension is related to Gravis UltraSound Sound Bank. You have chance to open fff files with Gravis UltraSound GIPC software.
These are the sound files which processed by sound card called Gravis UltraSound. The sounds are stored in a single file in groups. It is stated that there is a converter for this software however we could only find the following links. There is an emulator here. To get detailed information about the Gravis UltraSound, please check the following wikipedia link.
What to use fff
Gravis UltraSound GIPC
which page related to fff file
fff Related Searches
You can check related links about fff fileextension.