NCF – Extended list of Neutral creatures.

Unfortunately, there isn't a way to do that for Maya 6.0!

You need to import WRL or convert WRL to OBJ!

Can OBJ files be used here? Thank you for letting me know about this. I didn't notice it initially.

Added after 13 hours and 12 minutes
Can Alias Maya 6.5 be used for importing into the Nival format, instead of 6.0?

Added after 6 minutes
Hmm... According to the tutorial on your website, everything goes smoothly at first, but when you click on export, the following is written in the Log:
Maya session start failed: Create process failed: The specified file could not be found.

Can't open/read granny file for model \ Craature_veteran.xdb#xpointer(\Model)