Not many.
You can start it to open to news with
"C:\Program Files\Windows Mail\WinMail.exe" /newsonly or /news
for an individual message its:
"C:\Program Files\Windows Mail\WinMail.exe" %1
where %1 is the path to an eml or nws file.
If you search the registry for WinMail.exe you'll find a few more.
steve
