In this excellent volume, author Dave Roth (who, coincidentally, is a prolific Win32 Perl module writer) thoroughly documents and explains the standard extensions, gathering for the first time all of the information vital to squeezing the best from these freeware ad-ins.
From ODBC to user authentication over networks and even playing .wav files, there's something here to interest anyone using Perl on a Windows-based platform. Roth even explains the intricacies of using the Win32::API module to access dynamic-link libraries (DLLs) directly--powerful stuff, indeed.
Backed up by dozens of useful code snippets and examples, this is such a useful book that no self-respecting Win/Perl hacker should be without it.