extension matches are case insensitive on win32
extension matches are case insensitive on win32

Original git commit by U-GREEBO\Alexander Larsson <Alexander Larsson@greebo.(none)> at 1175075241 +0200

svn path=/trunk/; revision=430

gicmo/gvfs,gicmo/gvfs,philipl/gvfs,xkahn/gvfs-cmis,xkahn/gvfs-cmis,halfline/gvfs,philipl/gvfs,xkahn/gvfs-cmis,xkahn/gvfs-cmis,thiblahute/gvfs,gicmo/gvfs,philipl/gvfs,gicmo/gvfs,thiblahute/gvfs,halfline/gvfs,cpatulea/gvfs,halfline/gvfs,cpatulea/gvfs