A 900 MB file represents less than 5% of the original game data. To achieve this, a "ripped" version would have to remove:
To understand why a 900 MB version of Grand Theft Auto IV is suspicious, we have to look at the math. The official requires roughly 22 GB of disk space. Even "lossless" repacks from reputable groups like FitGirl typically only compress the game down to around 13 GB . gta-iv-900-mb
You may find that the game crashes during specific missions because the necessary audio or video files were stripped out to save space. How to Actually Run GTA IV on Low-End Hardware A 900 MB file represents less than 5%