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Jan 20

Unhandled Error in Silverlight Application 2104

When you get the error 

Message: Unhandled Error in Silverlight Application 
Code: 2104    
Category: InitializeError       
Message: Could not download the Silverlight application. 
Check web server settings

when you try to deploy your Silverlight application you have to register MIME type in your IIS 7:

Extension: .xap
MIME Type: application/octet-stream

At least that is what it worked for me.