The MSDN article you linked to is for .NET, not VBA. (Note where it says ".NET Framework" under the main heading.) You would need to recreate the macro as a .NET program in order to use that method. That method does not exist in VBA, hence it is not known.
Honestly, I am curious why you are wanting to test a dimension out to that many digits since there is no realistic way to even machine something with that amount of precision, assuming we are talking about normal units of measure.