http://bugs.winehq.org/show_bug.cgi?id=14627
--- Comment #34 from Rafał Mużyło galtgendo@o2.pl 2011-03-09 10:34:22 CST --- Well, I'd say Windows "workarounds" it in similar way - REGEDIT5 is the default on XP.
Still, while probably nothing can be done on command line, couldn't GUI at least pop up a warning of "Some of the keys were probably exported incorrectly" in REGEDIT4 case after such export ?
(and I still think a WONTFIX is more fitting for this case than INVALID)