hmmm, based on the HTML in the post, i am prompted to ask the following question :

Is this executing in a web browser ?

   Yes : While this is just a snippet, make sure the header is getting printed. Without it, it is possible standard prints will show up, but not the links.

   No : your tie command is missing the _ in $file_folder. Assumably a copy/paste error, but maybe not ?

Just a guess, but not sure, never really used IO::Dir

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i had a memory leak once, and it ruined my favorite shirt.