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in_some_sub{
     open(THISFILE,'< $file') or warn "ERROR: Can't open $outfile!\n";
...
        return unless ($data);
       remove_dupes($data,$file);
}

Fingerprinting files with MD5SUM...

...
2."./tux_trek.gif" ,or
3. Ignore and do not delete either file.
(1/2/3)?:

C:\WINDOWS\Profiles\madams\My Documents\My Pictures>md5sum -b Thumbs.d
+b ABNC001.JPG vincent05.jpg tux_trek.gif
0b32237bb069cff23325ef2ea6c386ca *Thumbs.db
06b0c8cc903f49d131b27621389fb57d *ABNC001.JPG
032c0f9c5b5e9afe63936417037d8f4a *vincent05.jpg
8294e114b207d343000f74c72840a1ed *tux_trek.gif

              (__)
              (\/)
       /-------\/
      / | 666 ||
     *  ||----||