NVIDIA GameWorks Integration

First post , and new to UE4, so bear with my noobyness. Sorry if has been discussed before.

I’m trying to import an .apx Hairworks file saved out of the Hairworks viewer into the latest version of UE, but I don’t even see the .apx file option on the import list. Won’t read the .apx file, and drag and drop doesn’t work either.

I’m using the regular version of UE 4.18.1 downloaded through the launcher, do I need to build UE from the source code to use GameWorks ?

Many thanks.