It is working now.
I installed SAW and MWS again.
Could not find that missing or corrupted file, it was not in the SAW studio directory and not on the whole system.
I did a really big cleaning in the computer and cleaned up a lot of things, I also moved 15 GB in total to another disk.
Maybe that was the reason... although I had been working with SAW after that for several hours before the strange error happened,
maybe it was due to something else, it was mysterious anyway.
Really glad it works now.
PS: Good to know about that -prf file anyway, Thank You.

It is working now.
I installed SAW and MWS again.
Could not find that missing or corrupted file, it was not in the SAW studio directory and not on the whole system.
I did a really big cleaning in the computer and cleaned up a lot of things, I also moved 15 GB in total to another disk.
Maybe that was the reason... although I had been working with SAW after that for several hours before the strange error happened,
maybe it was due to something else, it was mysterious anyway.
Really glad it works now. :)
PS: Good to know about that -prf file anyway, Thank You. :D