Transfer MXF-file to PDW-U1 on PC

Hello everybody.
I am trying to transfer a TV-report back on XDCamHD-disc.
As I still have the Tiger running on my G5 it is not possible to write on the drive out of FC. So I transfered the MXF-file to my PC and installed all the drivers (FAM 2.300, SxS 1.01., Drive Software 3.1.1.5, SxS UDF 1.0.2.6, XDCam Browser 2.0.0)
The drive is recognized and running. I click on the drive and select "import". Then I select the MXF-file. The copying-process starts and is interrupted again. "Reason: You don't have a right to access the file or writing is prohibited for the file."
I formated the disc, I checked the rights of the file and set it to read and write for all persons. I have no idea, whether this is a driver-thing or something between MAC and PC.
Any ideas?
Thank you very much for your time and help!

Timm