On NT, it automatically modifies the system environment (I guess this is stored in the registry or something). You can see this by right-clicking on My Computer, selecting Properties, and selecting the Environment tab. I don't know if Win9x has something similar or not, but it seems strange that the installation would skip something like this. Indeed, the release notes indicate that somehow, it
be adding this information to the PATH. Under Win9x, I wonder if this cannot be done via the registry as well...