@crazy_dave:
Maverick? Omg they give up with felines? That's a revolution and a disappointment I was waiting an OSX Cat.

The problem of first Mac Pro with Mountain Lion is because Apple give up support EFI 32bit. The first Mac Intel (January 2006) was with EFI 32 and the Mac Pro Rev 1.1 is the last series with this. In fact some special Mac Pro 1.1 models has a different processor version and are EFI 64 bit compatible.

But that was very transparent because the EFI could be 32 bit and the OS 64 bit. Then it becomes less transparent because of Windows 7 not supporting installation on EFI 32 bit but only 64 bit or BIOS. It was more troubles and hacking to install it than impossibility.

And then Mountain Lion, but in fact there's a very complicate procedure to install it anyway, but not for me. And also no chance that any future OSX will be more compatible. And for windows it won't be better. It was already complicated for Windows 7 but for Windows 8 I'm not sure it's even possible.

Well I suppose old PC with BIOS are better supported by Windows but who really use a PC from 2006? :-P I still has few games installed from 2006, huu, not many because of multiple cleaning to get free space, but still some and that seems a century ago. :-)

EDIT:
About wrappers, perhaps I'm influenced by trying them too soon then give up but I didn't get luck with them with Snow Leopard. And the Witcher 1&2 and Torchlight 2 are quite showing there's a difference, with exactely the same Hardware.

EDIT2: Ok I know Lion isn't a feline but well admit everybody feel it's in the similar category.