Use of $ZUTIL(12)

As you know the $ZUTIL method is deprecated and I'd like to replace this calls for the corresponding ones.

In my case I'm looking to replase $ZUTIL(12)  by  ##class(%Library.File).NormalizeDirectory("")

But the response is not the same while $ZUTIL points to mgr folder NormalizeDirectory points to my Logic Databse Folder.

Is there a way to proper do this replacement?

Thanks a lot