When this extension is enabled, I get errors building a solution (and these errors go away when the extension is disabled):

C:\Windows\Microsoft.NET\Framework\v4.0.30319\Microsoft.Common.targets(2868,9): error MSB3021: Unable to copy file "obj\Debug\MyProjectAssembly.dll" to "bin\Debug\MyProjectAssembly.dll". The requested operation cannot be performed on a file with a user-mapped section open.