MU as standart program for .mup files.

After I upgraded to MU12 can I not set MU to be the default program to open .mup files
Is anyone else having the same problem or a solution?

\ Niels Thule

We are running MU2012 and do not have that problem.
Although we are still running in Windows XP 2002 v SP3.

Okay, then I think it is a Win problem.  :(