This is almost certainly a poorly renamed OBB file created by a modder or a warez group attempting to bypass license verification or merge modded assets into the legitimate game structure.
The file "main.8.com.rockstargames.gtasa patch.8" seems to be a patch designed for Grand Theft Auto: San Andreas. Patches are typically software updates that fix bugs, improve performance, or add new features to a game. In this case, Patch 8 likely addresses specific issues or enhances gameplay for the San Andreas title.
Using a file manager (like Solid Explorer or CX File Explorer), navigate to: Internal Storage > Android > obb > com.rockstargames.gtasa