The keys.dat file in Grand Theft Auto: Vice City is a configuration file that stores your custom keyboard mapping and control settings. While it might seem like a boring system file, it has some technical quirks and "lost content" lore that make it a favorite topic for modders and speedrunners. Key Facts & Technical Quirks
: Go to your Grand Theft Auto Vice City installation folder (e.g., keys.dat gta vc
| Attribute | Value |
|-----------|-------|
| Typical Size | 1,044 bytes (varies slightly by patch) |
| Magic Bytes | None visible (no standard header) |
| Endianness | Little-endian (x86 compatible) |
| Editability | Not human-readable; requires hex editor or specialized tool (e.g., GTA Modding tools). |
| Dependencies | Read once at game launch; written when user changes controls via Options → Controller Setup → Redefine Controls | The keys
User Data: Do not confuse it with gta_vc.set, which stores official game settings and is located in the My Documents \ GTA Vice City User Files folder. Troubleshooting "keys.dat Not Found" Errors Variants exist: plain-text key=value entries or short binary
Developer Remains: These files are often associated with scripts and compilers that were accidentally left in certain game builds, allowing modders to use the original mission scripts to build new content.
Mod Integrity: The file must be present in the main game directory for the Ultimate Trainer to initialize correctly. If it is missing, you will often encounter a specific error message: "Not in GTA Vice folder, keys.dat not found". Common Errors & Fixes