Hey, thanks a lot!
Had to do some research on using a VM, but it worked out in the end.
I just saw that the latest firmware version fixed the problem and made the saves accessible on Windows.
Hey, just want to push this Thread because I am having the same question.
I'm using two SD cards. 1. for the firmware and 2. for the roms.
From my experience the saves have to be on the SD card with the firmware. When i changed the first SD card with another one that hast the firmware on it...