Also trying to download your XMA converter I get report from google its infected by virus.

Please go away.

Is there documentation of format for over 30000 files you have?
What exact steps you do?
I can add support for such files if I know some basic info like:
Where one can gather sample rate, number of channels and others?

FFmpeg supports XMA2, but how it could support headerless formats like you posted. is different and off-topic problem.

Please upload/provide somehow files that do not work for you.

Your command is wrong, you need to pass full and correct path to SOFA file.

How do you know it is messed up?

What tells you that params you entered give softcubic 75?

What's not clear?
Make sure that input audio is multichannel, otherwise you will not get much.

seems to wurk ok here, at least it runs anyway :) download C:\Downloads\ClubFritz6.sofa to current working directory: C:\Downloads\ffmpeg-sofalizer\2016-07-01-g77eb05a\32-bit\ffmpeg-static\ffmpeg.exe -i sintel.wav -vf sofalizer=sofa=ClubFritz6.sofa:type=freq:radius=1 sintel.fritz.wav ffmpeg version...

So pandy, have you still problems with sofalizer filter?
I tested it on Win 10 build with minigw64 and it worked fine.