Ok So I customized a known working winntbbu.dll file. I expanded it with "expand -r winntbbu.dl_" and got a new file. I opened it in ResEdit (the one recommended can remember the name) and replaced the files with my bitmaps. I did not call them the same thing, does that matter? Anyways I saved it, replaced, and opened it in the Color Changer. Changed my colors clicked applied. Successful. Then I opened that batch command that was fixed yesterday and it said "have a good day" etc. I took the new winntbbu.dl_ file placed it in my I386 folder and made the iso. Then I opened in in Virtual PC (on a mac actually) and I get the "The file winntbbu.dll was not copied correctly. The file Setup placed on your hard drive is not a valid Windows XP system image." The date on the file is Aug 23, 2001, 9:00 AM so I know that batch file worked. I don't know what I could have done wrong because I have done it multiple times. It is attached bellow copied directly from the iso. Thanks mike WINNTBBU.DL_