IIS 7.0 and WCF

Not sure what I'm doing wrong here. I have Vista Build 5308 with the
February CTP of WinFX. I installed IIS after WinFX, so I remember from
earlier WinFX builds that I need to run "aspnet_regiis.exe -i" to register
extensions, mime-types, etc. Something is still wrong though, as I get an
unknown mime type error whenever I try to access the Service.svc file in a
WCF project. What step am I missing?

Thanks!

-Arian