http://bugs.winehq.org/show_bug.cgi?id=58529
--- Comment #22 from Eric Pouech eric.pouech@gmail.com --- (In reply to Ken Sharp from comment #20)
Created attachment 79020 [details] Patched wine-10.12-135-g7c7b3e43047 +mountmgr
Not sure if it helps but I've uploaded a +mountmgr with and without the patch applied.
thanks for both logs, that proved to be useful.