ok i just did a trial and error installation of windows. i just found out the when you install programs on a separate partition, it still gets written in the registry of the C drive (or whichever the OS is installed on). so yeah... just like what MrRandom said earlier but instead of having a "file" that tells where all the programs are installed, it's in the registry.
i guess this means that a fresh installation of windows will wipe out the registry, so it's almost pointless to install in another drive
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