I don't know about using the "Win32" modules (I'm not a M$-Windows user), but I happen to have a nice, general purpose utility that I whipped up a while back -- I just posted it here at the Monastery: xls2tsv.

The cpan:://Spreadsheet::ParseExcel module makes for quite a nice approach, and it works on all OS's (not just windows), which is a huge factor for me. It's also possible, using that module, to keep track of things like font styles (bold, italic, underline) and colors in cell values, in case that's something that matters to you.