+3  A: 

Does the server have the registered MIME type of application/x-silverlight-app for the XAP extension?

Tim Heuer  2009-02-02 05:28:18
thanks, that is my developement machine on which I installed visual web developer and blend, don't know why it does that, in any case, tried it on other machines and it works, e.g.: http://tanguay.info/web/examples/silverlightInfoFlip
Edward Tanguay  2009-02-02 05:40:48
+2  A: 

You are not running the page via the development web server but your file system. If you run the page from the development web server or IIS, it should run fine.

You can see this from the URL in the browser: it is not http:// but file://

Michael S. Scherotter  2009-02-02 07:40:17

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