Can the installation packages of some stand-alone games be completely "decomposed"? For example, can 3D third-person action games be installed in the game package?

In order to protect their own interests, most games will be encrypted, packaged and protected.

However, experts will make extraction tools for popular games. In this way, you can extract pictures or music materials from the game.

Unpopular games don't have this treatment. Remember, it's also the bottom line: don't profit from other people's game materials.