Let me join you with this trouble, that I have stumbled upon a year ago on my laptop. I had plenty of interviews recorded via mic, but I was silly to just transfer those on hard drive without converting into wav. Then one day, my hard drive crashed. Most of stored data (including *.oma tracks) I was able to retrieve and back up on a different hard drive. After replacing a hard drive and re-installing OS (Genuine WinXP Home from recovery CD) and Sonic Stage software I now get these error messages: 1) When I try to open a file 2) When I try to convert it to WAV.