Rather than showing you how to use OLE or COM directly and extensively from Perl, as I had hoped, the book's main point seems to be that you can call VB macros from Perl. It offers little help in learning VB or the Windows-specific features in Perl.
To his credit, his approach is very Perl-like: Use Perl as a glue language to bring other elements together to do work for you. However, the book does little to teach you how. I was very disappointed.