The DOS command PATHMAN.exe can make it easier to modify the system and user paths used by Windows XP.
You can modify the path environment variable directly from set path command in DOS. But if you do this you can remove the already existing paths instead of appending them.
When we launch advertised shortcut, it searches for all the key paths in the MSI to check if they all are properly installed on the machine. But have you ever wondered what is the difference between a normal and an advertised shortcut?
If you want to pass property or a directory in Custom action then you can use Set Property Custom Action and place it after Cost Finalize. Name the property with the name of the Custom Action you want to pass it to.