I keep getting the warning the dmg files aren't recognized

Is anyone else having issues with .dmg not being recognized? I am currently trying to open an updated xcode .dmg and it is not working.

I got the same message ".dmg file not recognized" (from just one file), and have re-downloaded it several times.  I have tried opening it different ways (in finder, double-clicked, open with, even burning using disk utility) but nothing has worked.
I have just started using MBP with mountain lion.  Is it possible the application is not compatible - mountain lion too new for the program I am downloading?

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