Unlock all HOTU expansion chapters in single player
In the neverwinter nights directory there is a file called nwnplayer.ini Open
the file and find the line that says "CODEWORD XP2=" or some variation thereof.
Change it to:

CODEWORD XP2=barkeater

If there isn't a "CODEWORD XP2=" line then just add it somewhere between the
"[Game Options]" and "[Control Options]" lines. After putting this in you should
be able to access all the chapters for the expansion campaign