Yeah, that's pretty easy to handle since GDI+ only requires a registry entry for WU to not complain. Correct for the most part. Some things are new files (like HighMAT), but everything in the pack installs with no EXEs, MSIs, or anything else. Basically, all files not being replaced in i386 are contained in a CAB archive and are then copied out of it by the INF doing all the install work.