Hi ,
This is because Windows files remain hidden, which are necessary system files, and are protected. You can enable hidden files for system files; they are not directly counted in the selection.
There's also the TreeSyze program that lists applications along with their space and path.
https://apps.microsoft.com/detail/xp9m26rsclnt88?hl=pt-BR&gl=BR
To show hidden files, go to Windows Explorer > View > Folder Options > Viewer > Show hidden files and uncheck Show system files.
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Thanks