The search string is a relic. It represents a desire for a simpler web where files were just files. But for a modern "Games as a Service" title, the search usually ends not with a download, but with a redirect to the Microsoft Store—proving that the walled garden has won.
When you open the Content Editor (accessible via Steam tools or the Xbox app), it builds a localized cache index of all game assets. index of age of empires 4