some things from the lobby are encoded in nwindow.dll - so you need to make modifications to this file + make sure that this file is without a temid protector ( the original ones are protected ) but you can also find clean ones on our forum.
will accept the link below
in the screenshot you can see an example of a search in this dll file
( yes , there is a kr version of the texture - but just an example )
so about the coordinates, the usual ones are in xdat,
but for some windows you need to look in the dll of the nwindow.dll