... or alternatively

@ARGV = map { glob $_ } @ARGV;
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or, if you want sane whitespace handling,

use File::Glob qw(bsd_glob);
@ARGV = map { bsd_glob $_ } @ARGV;
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, optionally in a BEGIN block. But now, actually looking at the source of Win32::Autoglob, that's just what the module does. Thanks for pointing it out to me :).