FxCopRules Property MSBuild Extension Pack Help 4.0.12.0
Sets the location of rule libraries to load (/rule option). Prefix the Rules path with ! to treat warnings as errors

Namespace: MSBuild.ExtensionPack.CodeQuality
Assembly: MSBuild.ExtensionPack (in MSBuild.ExtensionPack.dll) Version: 4.0.0.0
See Also

Reference