nice mess

What are you trying to play ?
If it's a XBLA, xexmenu doesn't play them.
And location is as you said Content/00000000.
So your solution would be to use XM360 or Freestyle (or any other).
So transfer it back to Content/00000000 and launch one of those apps
to play it.
If it's a full "DVD" game ..., well in that case this doesn't look like it is.
It's a full game which I made from iso wit Iso2God. Then I upload with ftp. (Alien vs Predator, MW2, ...) I can run this game from the original dash, but in Xexmenu and Freestyle dash not discovered it....