I already sent this mail to the zlib maintainers but I'm not sure the @gzip.org email is read that often =)
While building the libs required for the PHP releases and tests
version, we got a little error in the zlib ASM version. The attached
patch fixes it and works here with VC8, vc7.0, vc7.1 and VC6. It has
been written by our GSoC student, Alejandro Leiva Rojas.
About vc8+ support, would you like to bundle a vc8 and 9 project files and solutions? I can send them too.