If the zlib1.dll was not in system32, its path is surely listed in the PATH enviromnent variable.
VGMPlay crashed for me a long time ago, because an installed GTK came with its a bad zlib dll and VGMPlay tried to use it.
problems with vgm_stat
solution: install a new zlib1.dll
Technical discussion about the VGM format, and all the software you need to handle VGM files.
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You are right, somehow "C:\Programmi\MKVtoolnix" ended up in the path variable, and that's the directory with the broken 74kB version of zlib1.
Hopefully these posts can be a reference for other people with the same problem
Hopefully these posts can be a reference for other people with the same problem
Also known as nineko.