Even if the 1GB file extracts to a larger folder, the game will likely crash on launch due to missing assets, silent audio, or invisible textures—making it unplayable.

The pursuit of a "highly compressed 1GB" version of Grand Theft Auto V

: Some "1GB" downloads are actually fan-made games that resemble GTA 5 but are not the original Rockstar title; these often expand to 2GB or more after extraction. Risks and Safety Concerns

Highly compressed games, especially ones as massive as GTA 5, often involve some level of data loss or modification to achieve such a small file size. This can result in: