I've got something quite similiar (if not the same?) as DivingDuck.
0.5 was absolutely no problem, with 0.6 I get
"Exception has been thrown by the target of an invocation."
in exactly the same box as DivingDuck at the same occasion, whenever I try to open any file.
I have no idea if this error message in English helps you any further, but we may hope

.
Oh yeah, and of course a giant THANK YOU for this absolutely awesome tool, making modding by far more easy