Before proceeding, remember that FitGirl repacks are unofficial modifications.
Playing Doom 3 on modern hardware is best achieved by using source ports like dhewm3, which enable native 64-bit support, widescreen resolutions, and enhanced audio. These engines allow for "extract and play" functionality by utilizing original game data files, which can be further improved with HD texture packs and UI fixes. doom 3 extract and play xedious fitgirl repack