https://wccftech.com/red-dead-redemption-2-pc-looks-more-likely/

Red Dead Redemption 2 PC may not be just a dream after all. GTAForums user BlackScout revealed to have found a series of game parameters, functions and strings in the game’s Companion App for mobile devices.

A few are particularly interesting, such as various setting presets (from Low to Ultra as well as a Custom preset for manual tweaking) and various advanced graphics settings similar to the ones PC gamers are very much accustomed to seeing. Furthermore, there’s the mention of NVIDIA’s TXAA technology which is already featured in Grand Theft Auto V, Rockstar’s last PC release. Given that TXAA is a PC-only technology, there’s no chance it could be something related to the existing console versions of the game.