Hi,
There is a simple workaround:
- open the .ma exported by MM with your favorite text editor
- find the line:
requires "maya 2.0" (at the beginning of the file)
- replace it with
requires "maya 6.0"
- save and close your .ma file
That's all!
It should now correclty load in Maya 8.5
Hope it helps,
Niko