Your problem is that Unix expands wildcards before passing them to the program. Windows doesn't do this, prefering to let the program carry out it's own wildcard expansion.

You could get round it by adding another loop and using the glob operator.

foreach my $glob (@ARGV) {
  foreach my $file (<$glob>) {
    print("converting $file...");
    open(FILE, "<$file");
    my @lines = <FILE>;
    close(FILE);
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Update: Abigail is right. I should have said "The default Windows shell doesn't do this".

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