Mounting an Amiga drive in WinUAE is no problem at all!
You should just resist to do anything in Windows/DOS on it, as this will kill the RDB and wipe out all data on it...
Just fire up Winuae and choose your Amiga-drive as bootdrive or something similar, and choose a directory on your Pecee to be used as another partition. Then you can copy everything from the ami-drive to your second partition(actually a directory on your pecee) using WinUAE, and then back up the directory using some recording software on windows. It worked flawlessly for me!
