well...there are programs out there that let you read Mac disks on a PC and PC disks on a Mac...the one for the PC is called Mac Drive and the one for the Mac....not sure..I can find out tomorrow!!!
Otherwise it's about renaming the files basically...couple of people on the Nuendo forums dscribe how they did it and worked fine for them!
Opus

There's another program we use at work called Mac Opener. It runs on the Windows side and works pretty good.

My friend burned the project folder onto a cd using PC format from his mac. When I went to open it there were all kinds of file errors when trying to open the project it couldn't find stuff. It wasn't just a matter of renaming stuff a bunch of stuff just seemed like it didn't exist.

d./

Did he burn it as in ISO 9660 format disk? What program did he use? Toast?
Opus