I've found that file by chance...
https://www-user.tu-chemnitz.de/~heha/hs/petzold.chm (https://www-user.tu-chemnitz.de/~heha/hs/petzold.chm)
still valid help file to program win32 api
and other misc items
https://www-user.tu-chemnitz.de/~heha/hs/free.var (https://www-user.tu-chemnitz.de/~heha/hs/free.var)
if you download a .chm file do not forget to unprotect it via properties...
marc
and the cd content with all c code examples...