On the face of it your syntax is fine. Is parser.exe on the search path or in teh current directory?

As a test you may care to try `notepad.exe` instead.

You can iterate over the files in a folder like this:

use strict;
use warnings;

my $scan;

opendir $scan, '.';

while (my $entry = readdir ($scan)) {
    next if ! -f $entry; # Skip if not a file
    print "$entry\n";
}
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