Defines the bitness of the task if it must be run specifically in a 32bit or 64bit process. If not specified, it will run ...

Defines the bitness of the task if it must be run specifically in a 32bit or 64bit process. If not specified, it will run with the bitness of the build process.  If there are multiple tasks defined in UsingTask with the same name but with different Architecture attribute values, the value of the Architecture attribute specified here will be used to match and select the correct task