A guy asked me on steam how to get poland and hungary playable in the grand campaign, so here it is.
How to use:
If you have NTF and want to play in singleplayer, place the startpos.esf in Napoleon Total War/NTF/campaigns/1. You have to overwrite the existing file, so maybe you should backup.
For multiplayer you make this in Napoleon Total War/NTF/campaigns/11.
If you don't have NTF, go to Napoleon Total War/data/campaigns/mp_eur_Napoleon. It's both for singleplayer and multiplayer.
Hope you will enjoy it!
Credits are going to HusserlTW for NTF, on which this mod bases on.