This page tells me that I need to add some handler mappings when configuring IIS.
Specifically, it says "... Make sure you have enabled handler mappings for *.svc and *.xamlx with executable path set to one of the following..." I've gone in to the relevant bit of IIS and seem to have 4 options:
Can anyone clarify for me which option I'm supposed to use?
The option that you are looking at is actually related to IIS 6, where you have different architecture. The options that you describe are actually for IIS 7+, so you need to check the sections bellow the one for IIS 6 to verify whether your instance is configured correctly.
the Telerik team