Yes, you will need to Rebuild after installing anything for Band-in-a-Box. The Rebuild button is in the Style Picker window.

If the rebuild does not help with getting the Xtra Styles found, first make sure you have the latest build update for your version is installed from here: https://www.pgmusic.com/support_windowsupdates.htm

If that still doesn't help, then something went wrong during the install process of the Xtra Styles. Or you are opening Band-in-a-Box from the incorrect location. You had mentioned that you are storing the installer files to your K drive, your Band-in-a-Box program is on C, and the RealTracks are on your Audiophile drive. What drive letter is assigned to the Audiophile?


Best,
Chantelle