Seems like an easy enough concept and we map alot of drives. But we had a special situation.
Everyone has a drive mapping of J: but we had a program that required a drive mapping of J: (to a different folder).
So using EM tell it that when INEEDJ.exe is started then it will unmap J: then remap J: to the correct location. It is a simple solution and required no scripting. Just type in the EXE and add a few more steps and it was done.