https://bugs.winehq.org/show_bug.cgi?id=47275
--- Comment #4 from Fotan avenjames@live.com --- (In reply to Gcenx from comment #1)
Especially for an OSX to setup cross-compiling with MinGW, I think that's not an easy way for most users operating.
Otherwise, I googled for an information mentioned the System.reg missing key with some values which might related to this happening,
Locate to REGEDIT -> HKLM -> System -> CurrentControlSet -> Services, version 4.7 there's a key named "MountMgr", but after version 4.8 & 4.9 was missing this key.
Tried to create and insert the value but no help.
Is necessary to setup the MinGW then fixed this error tab?
Created attachment 64570 [details] Wine-Staging-4.9 64Bit winecfg log
I've also got the same issue and had opened a bug-report for packaging here https://bugs.winehq.org/show_bug.cgi?id=47224
Also someone confirmed on my report with the same issue using Redhat.
So without mingw wine64 doesn't build correctly anymore, this making cross-compiling even more of a headache.