http://bugs.winehq.org/show_bug.cgi?id=32856
--- Comment #1 from Detlef Riekenberg wine.dev@web.de 2013-03-03 16:16:55 CST --- When i used qemu with windows vm some years ago, i had a small d: drive and moved %TEMP% to d:\temp for easy cleanup.
That d: drive was used for all windows vm.
Beware, that winetest had additional failures when running in the root directory of a drive.