I love the previewers in Outlook 2007. I just wish there were some for the file types I need to preview. Whaddya know? There are...
- Adobe Reader PDF Preview Handler
- Foxit Reader PDF Preview Handler
- Code Preview Handler for C#, VB, SQL, etc. (Source, Installer)
- MSDN Article on writing your own preview handlers.
- Handler discussed in the article (Zip, XML, XAML, resx, CSV, MSI, IE, etc.)