Trimbach did not open $file_name because the CGI module actually handles that part:

       CREATING A FILE UPLOAD FIELD

        ...

       When the form is processed, you can retrieve the entered
       filename by calling param().

              $filename = $query->param('uploaded_file');

       ...

       The filename returned is also a file handle.  You can read
       the contents of the file using standard Perl file reading
       calls:

               # Read a text file and print it out
               while (<$filename>) {
                  print;
               }

               # Copy a binary file to somewhere safe
               open (OUTFILE,">>/usr/local/web/users/feedback");
               while ($bytesread=read($filename,$buffer,1024)) {
                  print OUTFILE $buffer;
               }

        ...
[download]

There's also an example on checking the mime type:

        ...

       When a file is uploaded the browser usually sends along
       some information along with it in the format of headers.
       The information usually includes the MIME content type.
       Future browsers may send other information as well (such
       as modification date and size). To retrieve this
       information, call uploadInfo().  It returns a reference to
       an associative array containing all the document headers.

              $filename = $query->param('uploaded_file');
              $type = $query->uploadInfo($filename)->{'Content-Type'};
              unless ($type eq 'text/html') {
                 die "HTML FILES ONLY!";
              }
[download]

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