There seem to be some mods already floating around, the ones I saw were for enlarging the item tooltips and for increasing/eliminating the inventory limit. The mods themselves were just XML files that had to be copied into a certain folder.
From this I gather that one should be able to extract basic game parameters from the files present in the Witcher 2 installation. The quick availability of the first simple mods indicates that the game seems to be relatively mod-friendly.
How would one go about extracting the necessary XML files to start modding the Witcher 2?