First off you need to note that system runs a command on your OS. This is almost a shell script.

Your code uses the following *nix commands:

1. sort
2. uniq
3. mv
4. spell

Additionally it runs certain Perl scripts, ( The perl5 ... bit ) and redirects the output to files that are then subsequently sorted, moved, deleted ...

To get this to work you either need to call your other Perl programs as functions and user Perl to sort and uniq and so on OR you need to find windows equivalents to each of these commands, and make sure that they work from command line before creating a script with it.