xSend and mul files

[Vevusio]

/*edit
ok, I'm stupid, didnt read the sticky *g*
*/

my second problem is, i want to insert some new gumps, animations and stuff into the client, when exchaning some existing data in the mul files it works (well of course it does...) but if i add them to free slots and change the ids in the code/scripts it doesn't

a guy said i need to hex-edit the client but i have no clue which part of the asm code i should change (out of the xxx asm code lines), and i don't really know asm at all...

so, is there any tut or smth?

thanks already