Keep in mind that, at least on Win2k, that %* at the end will tell Windows to feed the entire rest of the line to your script, including redirects. So if you tried this:

.\output.pl > anotherfile.txt
[download]

@ARGV would look like this:

@ARGV = ('>', 'anotherfile.txt');
[download]

and the output would not be redirected. For that reason, I always use the perl script.pl version on Windows, which will work correctly with redirects.