So, what is a GXT file, and how does it relate to the game's soundtrack? In GTA: San Andreas, GXT files are used to store text and audio data, including radio station names, song titles, and artist names. The GXT file for the American radio stations in GTA: San Andreas is particularly interesting, as it contains the original text and audio data for the radio stations.
This will automatically detect modified files and redownload the original versions.
These were likely tied to the early "respect meter" that later became mostly mission-based. The fact they remain in american.gxt proves Rockstar considered dynamic social consequences for violence.