Demo Problems

[Kechlion]

I have recorded a few demos and had them work fine (played in TWL for a bit) but then I upgraded and had to reformat my computer. Now whenever I record a demo, the demo shows up in my folder, the problem is that when I try to play them it says that demonamehere.wav is missing... I've never seen anything like that and have searched my comp for the supposed .wav file that it said it was missing... but if I remember correctly before it was all one file. Anybody know wtf is going on?