The PCGamingWiki recommends "ThirteenAG's Widescreen Fix" for modern resolutions, which is typically downloaded as a .zip file and extracted into the game directory. Downloads - Rockstar Games

Available as a direct purchase for iPhone and iPad.

Search for Grand Theft Auto III or use the package name com.rockstar.gta3 . It is a paid application that requires approximately 1GB of free space.

The Definitive Edition is available on Steam and requires a modern 64-bit processor and 8 GB of RAM. Technical Support and Patches

Rockstar provides a v1.1 patch to resolve stability issues.

If you have an active Netflix subscription, you can download the GTA III – The Definitive Edition at no extra cost through the Netflix app or the App Store/Play Store. PC and Console Versions