Parallels creates a network share in the windows VM mapping my home drive on my Mac. That is intended (option in "Sharing"->"Share Mac"). But I need to be able to adjust the drive letter parallels is using for that share. By default, it always uses drive Z. Since our company uses a script on our domain controller to map certain drives (on with the letter Z) that script fails and leads to an weird Microsoft gpsvc-bug where it uses up a complete cpu-core. Right now we disabled the mapping script on my account and I also filed a bug with Microsoft. But an option to change the default drive letter would be more than appreciated.