It points to the folder that contains your NX installed ugii.exe file.
You must have NX installed in order to import NX files into Wildfire.
If you have NX, you do not need to have Wildfire installed to import Wildfire files.
You do have to pay a license fee for the either import license. The Wildfire import license fee is less than the NX license fee since Wildfire requires you to have NX installed. The license fee for Wildfire is about 1/3 the cost of the NX license fee. Add the cost of a seat of NX to the Wildfire license fee and it adds up.
"Wildfires are dangerous, hard to control, and economically catastrophic."