I have not done this in awhile, but in general the .ini file is just a text file. You need to find the patches.ini file in the Power Tracks folder and just modify the text to add the new KorgXXX.ini file to the end of it. The next time Power Tracks opens the patches.bin file will compile the new information from the modified patches.ini file and the Korg information should show up in your patch selection dialogue.

As an alternative, there is a menu item under the "Action" menu in Power Tracks that allows you to convert a .pat file from BIAB or a .ins file from Cakewalk and automatically add it to the patches.ini file.

BTW, this is exactly the same in RealBand. Good luck.