In the early stages of GTA San Andreas, the developers planned to add safes that the player could break into.
For some reason, this mechanic was not implemented, although all the files and lines of text remained in the game. This modification fully restores this function.
Safes are located in houses that you can rob during a thief mission. Approach the safe to start breaking into it. Carefully turn the toggle switch to the right or left, listening for sounds and clicks. The safe can hold anywhere from $30,000 to $80,000.
You can see the number of safes cracked in your stats (in the pause menu).
You need a game with the CLEO library installed. Move the file Cracking safes in houses.csa to the folder data/com.rockstargames.gtasa