I downloaded Xplay V3.02 from Mediafour to try out. It copies files to/from Ipods. When I try to browse a folder in it (it opens DOpus) and then crashes when I try to change folders and I get a message asking if I want to debug (in visual studio). I'd love to see you support this program as (when I use Windows Explorer it seems like it may be a keeper). Secondly I am wondering if there is a way to quickly/easily disable replacing Windows Explorer, so Xplay will not user DOpus which crashes. Or a way to quickly/easily disable DOpus from popping up when a folder is clicked in Windows Explorer (I suppose I'd love it if this were always the default though I want DOpus the default when I don't start my exploring files in Windows Explorer).
You can configure which folders Opus handles, or turn off Explorer Replacement completely, via Preferences - Launching Opus - Explorer Replacement.
If you want the compatibility problem with XPlay to be investigated then you should send a support request to GPSoftware as it's unlikely to be something that anyone other than GPSoftware and/or Mediafour can solve (depending on what the exact problem is).