macosx: work-around for Mountain Lion which treats folder with the name 'BDMV' and the sub item 'INDEX.BDM' as a file with the UTI 'public.directory'
(cherry picked from commit 79c8560a5e36d6f872a740aeeb6a62c8069c3eae)

Conflicts:
	modules/gui/macosx/open.m