Why do I always lose this file?

I run a dual-booted HD2 from SDCard/HaRET with MIUI Android & stock WM6.5. I keep a copy of this file in \Storage Card\My Documents for listening in CorePlayer and survive possible hard resets. However, **everytime**, and I really mean **every** time I boot MIUI this file disappears from the SD card. I'm unable to locate it from Android and when I reboot into Windows I see no traces of it. Why the hell (can I say hell?) does Android delete the file from SD on every single boot? Does it hate M3U files?