How about hook the API about loading resource? Memskin(the software I mentioned in first post)'s author said that he use hook to achieve this. Currently I don't have any ideas to do this in detail My purpose is want to make a program to change anohter program's 'skin', so it can be customized to my own taste

It seems that this can't work at runtime, This function change the resouce in the image file I want to just change them in memory

Any hint about write a program which can change other's program at runtime? Just like this one, it can change the UI of live messenger: http://memskin.fanatic.net.nz[^] This programe looks like implement a loader to load the customized resource, then load the WLM. Does anyone know some details about this or some materials to study? Is it possible to change other program's UI when it's running?