Here’s a tool that I ended up using quite a bit on the last project. MetaEdit is an IIS Metabase editor that looks and feels like the Registry Editor. It allows you to look at and edit the IIS Metabase.
While developing install projects with the Wise for Windows Installer 6.0, I saw that IIS virtual directories created by were not working correctly. I was able to view the virtual directory definition with MetaEdit to see that Wise had done wrong.