In CRM 4 we had a URL in the site map like this Url="../../isv/xxxx/yyyy/Migration/myreport.html"
In CRM 2013 we have the same, but instead of displaying the report when we click the button it shows the SSRS Home folder.
The html file is stored in C:\Program Files\Microsoft Dynamics CRM\CRMWeb\ISV\xxxx\yyyy\Migration
Should the setting in 2013 be different?