LWP::Simple is about the easiest way, although you forego fine-grained error checking. The basic recipe goes like this:
my $local = time . ".txt";
my $url = "http://www.example.com/";
my $page = get($url) or die "failed!\n";
open my $out, '>', $local or die "Cannot open $local for output: $!\n"
print $out $page;
You can then wrap that up in a cmd file:
And run that as a scheduled task. Make sure the scheduled task service is enabled and running. You might want to think of a better name for your local file.
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