I've only been using Blade for a couple of months, so take everything I say with a grain of salt. I went to a 2 day Blade training class in December, and don't recall anything about converting .ut to .nom. I just looked in the help files of Blade and BladeRunner, and didn't find anything there either. I don't recall seeing any type of automated conversion function to create the .nom files. I haven't had to do a P&W part yet, so I haven't had an opportunity to deal with .ut files. There's not a lot of Blade info on this forum, so I suggest calling (or email) B&S in R.I. Sorry I don't have more to offer. Good luck.
