In the Developer Edition what you create is a Visual Studio test list. The .aiilist file is only created by the QA Edition and its test list feature. To run a Visual Studio test list requires using Microsoft's MSTest command line tool like this:
mstest /testmetadata:TestProject1.vsmdi /testlist:List1
the Telerik team
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Telerik Public Issue Tracking
system and vote to affect the priority of the items