Looking for working SSD files editor

Is this ssd editor working correctly? I’m trying to make new soundset but upon saving I end up with a file without an extension. If I add “.ssf” extension myself to that file it doesn’t seem to work at all in game.

I tried that recently and it seemed working, but I only used it for reading anyway as I work with NWN1 and NWN2 ssf has different format.

After long search I end up with xoreos tools - Downloads - xoreos

it has ssf to xml and back convertor and handles all Bioware games including nwn2. Highly recommended.