Thanks jastey. I installed my 5CD version on a new machine (without any patches), extracted the DLG file and it was exactly same as the one you posted. With GivePartyGold(200),
But... when I played the game and CLUAed in Forthel, he gave me only 4 GP.
So I extracted the CRE file and Dudley's CRE file and did a hex compare. The only difference was in 0x001c, which according to a documentation I found means "gold carried".
And indeed, in the original file, Forthe only carried 4GP, while in Dudley's file he carried 200GP.
So am I correct in assuming, that GivePartyGold(n) attempts to give n gold to the player, but only if the character actually carries that much gold? That would explain it.
Thanks again jastey for taking your time to help with this.