I recently discovered how to make kotor 2 work on windows 10 in full screen. Here are the Steps:
#1 - "Install" the game in compatibility with Windows XP SP3 or 2.
#2 - Delete the shortcut that was placed on the desktop and replace it with a shortcut directly to the executable file (swkotor2.exe).
#3 - Right click on the new shortcut and go to the compatibility tab. Once there click on the drop down box for compatibility and point to windows xp sp3 or 2 (Depending on which system it worked for you last OR what works for you.) then tick the check box that says "run this program as an administrator".
#4 - Do a test of the program just to check to see if it runs or not.
#5 - Install the latest patch for your game.
#6 - Go to graphic while in game then go to advanced graphics options and tick off the "Frame Buffer Effects" and "Soft Shadows" settings. Everything else is fine...
#7 - You can now go to the games INI file and switch on fullscreen as you please.