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You could single-click to open files in Windows 98 already. You could also hover your mouse pointer on a file icon and it would become selected.

• trinix912 2y ago
  It was the Internet Explorer shell integration that brought us this feature. The idea was to blend the desktop and web user interfaces. If you installed IE4 on Windows 95, you'd get that option there too.
  • kapitar 2y ago
    Yes, it was called Active Desktop if memory serves.