map { $files{lc($_)}++ } <op/*>;
map { delete $files{"op/$_"} } split /[\s\n]/, `dir /b /l op & dir /b /l /ah op 2>nul`,
}
+elsif ($^O eq 'VMS') {
+ map { $files{lc($_)}++ } <[.op]*>;
+ map { s/;.*$//; delete $files{lc($_)}; } split /[\n]/, `directory/noheading/notrailing/versions=1 [.op]`,
+}
else {
map { $files{$_}++ } <op/*>;
map { delete $files{$_} } split /[\s\n]/, `echo op/*`;