I might have found a quirk in the PRF Editor that would explain why sounds won't play for you.
When you open a file to read or write data, you can use 'binary' or 'text' mode- meaning they are optimized for text or binary. The PRF files have both text and binary data so in some places I may have opened a file in 'text' mode and converted data to binary as needed. That usually wouldn't be a problem.
But, I found that on systems which use Unicode or other 2-byte per letter text encodings the text < > binary conversion routine can get produce unwanted effects.
Since you're one of those crazy overseas fereigner types, I expect your PC uses unicode? (I'll bet you even think that wacky metric system is better than the 'bout yay big' system we use here in the USA 
) The sound preview creates a temporary wav file and plays that. It's possible that SND and WAV files are not being produced properly on your PC. Did you ever send me the files?
When you open a file to read or write data, you can use 'binary' or 'text' mode- meaning they are optimized for text or binary. The PRF files have both text and binary data so in some places I may have opened a file in 'text' mode and converted data to binary as needed. That usually wouldn't be a problem.
But, I found that on systems which use Unicode or other 2-byte per letter text encodings the text < > binary conversion routine can get produce unwanted effects.
Since you're one of those crazy overseas fereigner types, I expect your PC uses unicode? (I'll bet you even think that wacky metric system is better than the 'bout yay big' system we use here in the USA
) The sound preview creates a temporary wav file and plays that. It's possible that SND and WAV files are not being produced properly on your PC. Did you ever send me the files?