What a GXT file is — and why it matters GXT files are plain-text data stores that the GTA series uses to map keys to in-game text: HUD elements, mission names, dialogue snippets, instructional prompts, even some UI labels. In San Andreas, the GXT format made it possible to localize the game across multiple regions without changing binary code. The file’s simplicity belies its importance: change a handful of strings and you alter the tone of NPCs, the jokes in missions, or even which references remain culturally legible to a particular audience.