thegeek
menu->global options->audio data->UNTICK "always import broadcast waves at their original timestamp"
Just came across this old thread as I was having the same problem. Had some violin tracks I had a musician record for a song and Acid and FL could open the files but not Sonar.
I tried a 'Save As' just saving again as 44.1 at 24bit like the originals but suddenly
those worked. I read up a little on 'broadcast waves', still don't fully understand why these files would be recognized as them, but unticking that option made it work, cheers.