I was recently writing a server status report program to check the statuses of servers and produces a text file report (stunning good naming scheme I know) and I ran into an error that was quite perplexing mostly because it shouldn’t have been happening for various apparent reasons. On launch of a unit test, I received the error

Could not load file or assembly 'file:///<insert network drive path here><insert project path here>binDebugsome.dll' or one of its dependencies.
Operation is not supported. (Exception from HRESULT: 0x80131515)

This is quite the problem since unit testing is a wonderful thing sent down from God Himself to bless us developers (who ever said God wasn’t good?). The problem here is that Visual Studio won’t load in untrusted assemblies, and assemblies on a networked drive are not considered trusted, *. That being said, to fix this problem, all we need to do is allow remote sources to be loaded in. Here’s how…​

Open up C:\Program Files\Microsoft Visual Studio 10.0\Common7\IDE\devenv.exe.config. Near the top of the configuration file (mine was line 10) you should see an xml parent of <runtime>. Directly beneath that add <loadFromRemoteSources enabled="true" />


Save and close out devenv.exe.config and restart visual studio. On restart, you should now be able to debug using assemblies in remote locations.