Short answer: it's not, and that's the problem. Long answer: Windows has a few conventions that make it "better", like a predictable place to install your file

Short answer: it's not, and that's the problem. Long answer: Windows has a few conventions that make it "better", like a predictable place to install your files, a global authoritative "registry", and never having dynamically linked (and separately installed) dependencies. By sheer virtue of not having a good package manager, Windows has avoided dependency hell. That does, however, still leave it without the utility of a package manager.