Spaces in the argument delimit distinct patterns, so
    `glob('*.exe *.dll')' globs all filenames that end in `.exe' or
    `.dll'. If you want to put in literal spaces in the glob
    pattern, you can escape them with either double quotes, or
    backslashes. e.g. `glob('c:/"Program Files"/*/*.dll')', or
    `glob('c:/Program\ Files/*/*.dll')'. The argument is tokenized
    using `Text::ParseWords::parse_line()', so see the
    Text::ParseWords manpage for details of the quoting rules used.