Millenium.exe

: Restoring navigation history for the internal Steam browser.

Depending on where you encountered the file, it may refer to older or niche software rather than the modern Steam mod: MILLENIUM.exe

: Install custom CSS-based themes to change the visual appearance of the Steam library, friends list, and store. : Restoring navigation history for the internal Steam

: Displaying real-time SteamDB data directly on game pages. MILLENIUM.exe