When running MSBUILD as part of an automated build process I get:
MSBUILD : error : CA0053 : Unable to load rule assembly 'c:\program files (x86)\microsoft visual studio 10.0\team tools\static analysis tools\fxcop\rules\securityrules.dll': Could not load file or assembly 'file:///c:\program files (x86)\microsoft visual studio 10.0\team tools\static analysis tools\fxcop\rules\securityrules.dll' or one of its dependencies. The module was expected to contain an assembly manifest.
The project contains several rulesets.
Even from inside Visual Studio 2010 SP I get the same message.