Most Vice City DE mod menus use DLL injection (similar to GTA V mod menus):
Because the DE trilogy uses Easy Anti-Cheat (EAC) only in certain cracked/online-avoidance builds, most single-player mod menus don’t encounter anti-tamper. But some repacks strip EAC entirely. gta vice city definitive edition mod menu
Rockstar Games and Take-Two Interactive have a complex relationship with modders. Most Vice City DE mod menus use DLL
The majority of mod menus are not hosted on official storefronts. They are found on forums, Discord servers, and file-sharing sites (e.g., MediaFire). This lack of curation leads to a high incidence of malware. Because the DE trilogy uses Easy Anti-Cheat (EAC)