Engine 3.0 gm3 unable to open legacy stacks on MacOS?

[Wilhelm Sanke]

I am in the course of updating my old "MC-Player" (for mc and rev files) 
using the 3.0. engine. One incentive to do this was to provide users of 
some of my stacks with embedded dialogs a possibility to open them 
without being annoyed by warnings and error messages in the Rev IDE.

On Windows (XP) this works fine, I can open stacks of all 
stackfileversions, pre-2.7 and >2.7 (and I have included the option to 
save 2.7-stacks as legacy stacks like in our MC IDE).

However, on my MacBook Pro the MC-Player only is able to open stacks 
with stackfileversion 2.7. The mc- and re-extensions do not matter here.

I have now tried to open legacy stacks on MacOS with engine 3 both in 
the Rev IDE and the Metacard IDE; all I get is either nothing or error 
messages.

What are your experiences? Could this be somehow related to the problems 
I described in my post to this list "Strange change of file associations 
with Rev 3-gm-3" on Sept 20?-

=============

Another question: Is there a way to start the 3.0 engine inside the MC 
IDE and coming up as "Metacard" (like it was possible with earlier 
versions)?
After I rename the "Revolution" file deep down in the OS bundle it 
refuses to start.

Best regards,

Wilhelm Sanke