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if ((exists $cacheHOA{$sum} ) && ($#{$cacheHOA{$sum}} <= 7)){...}

Can't use string ("c:\usr\local\bin\PixNews99\Downl") as an ARRAY ref 
+while "strict refs" in use at c:\usr\local\bin/md5summing.pl line 308
+, <STDIN> line 4.

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