How do I modify my settings to allow VS2010 to load 3rd party XSD files from the "Unauthorized Zone"?

Question

I have opened a 3rd party XSD file in Visual Studio 2010 that imports namespaces from other schema files from the same 3rd party.

In the XML editor view of the schema file, the xs:import element is underlined with the following error: Request for the permission of type 'System.Security.Permissions.FileIOPermission', mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.

I read the following blog post: http://blogs.msdn.com/b/xmlteam/archive/2009/06/04/understanding-xml-schema-sets-in-the-xsd-designer.aspx which states that it's a security zone violation and Visual Studio places the schemas in the "Unauthorized zone" in the XML Schema Explorer.

My question is - how do I change my security settings to allow these schemas to be referenced, or is there something I can do to make the schemas and namespaces associated with them "trusted"?

Answer 1

Had this issue myself - it was actually because Win 7 had blocked the schema files due to them being copied in from a network location.

To unblock individual files navigate to the file and use Properties > Unblock

For multiple files it's quickest to use Sysinternals' Streams to bulk change the location as described in this blog post.