Many may be surprised, but GTA 1 had Multiplayer, and officially with the assistance of DMA design (Rockstar Games). In multiplayer, up to four players could play simultaneously on one server. This launcher is capable of working as a launcher, but it has additional features, where the most basic one is the ability to play GTA 1 on some server over the network. By launching the game through the launcher, you can play regular GTA 1.

In addition to the main function, the launcher makes launching GTA 1 more convenient:
The launcher fixes the PLAYER_A.DAT file every time this program is launched, then it proceeds to launch the game.

What does this mean (in more detail):
During normal startup, GTA I changes the hex address byte "H4" from "06" to "00" every time the game is launched, causing the game to crash on subsequent launches. If you start the game through the launcher, then this launcher replaces the byte in the “PLAYER_A.DAT” file with “06”, then this program starts launching the game.

Installation:

Compatibility:

The game can be either a Windows version (from Steam or Rockstar Classics), or a regular one, or it can be a version on MS-DOS.