Thanks RichardK for another good suggestion. I've tried this, and it also seems to do the trick nicely: minimal changes to existing code, and I can dispense with the nested quotes. The only funny was that the File::Glob in my Strawberry Perl doesn't seem to export bsd_glob, so I had to call it by its fully qualified name, but that's no hardship. The only funny is that in the version of File::Glob in Active State Perl 5.10.1, the :bsd_glob export tag isn't recognised, but the function itself is still exported: use File::Glob 'bsd_glob';.

I see the manual page for File::Glob refers also to File::DosGlob, but I was a little too put off by the latter's manual page to take that idea any further.