No, you can't go ProRes, that's true, but you CAN use QT's PNG codec or you can export to PNG image sequences with an associated audio file, if any. The recipient will have to do additional transcoding to ProRes, but at least you will have given him or her lossless files.
It's just no fun at all to go between Windows and Macs. In fact, it stinks.
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA
You'd be better off just making disk images of your cards using disk utility, and giving them the .img files. They can then import them into FCP as ProRes using the log and transfer tool and the Canon FCP plug-in. All they have to do is open each disk image in turn, then import them as if they had the cards.
Doing a transcode for them causes endless format hassles on a PC, and won't save them much time unless you have countless hours of footage.
Edit Out Ltd
FCP Editor/Trainer/System Consultant
EVS/VT Supervisor for live broadcast
RED camera transfer/post