There really isn't enough information (that wouldn't go into a general Perl book) to fill up a Perl Windows book. Using modules is a general task that doesn't need its own book for every platform.

The old edition of Learning Perl for Win32 isn't languishing. We fixed Learning Perl to make a platform specific version unnecessary.

However, if you want a completely different book from that, then you're talking about something else. It might be nice to have a Win32 Perl Cookbook if you can convince a publisher that people would buy it. :)