Mulligun said:
If it is possible to modifie XP rewards (Number of XP's) for quests in Fallout 2 (using dat explorer or sth. similar)???
Yes, quite easily. You need to alter the scripts that give experience points when they count a quest as actually being completed. For example, if Becky gives you a quest to collect money from Fred and you return to her when the job is done, then it is Becky's script (dcrebecc.int) that needs to be modified. You would need to find out how to decompile scripts, then just alter the number of experience points given, then recompile the script.