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Scancode Mapper refers to utilizing the built-in Windows kernel-level driver functionality—specifically the Scancode Map registry entry—to permanently remap hardware keys on a keyboard. Because it operates at the lowest level of the operating system’s input stack, it requires zero background software to run and functions globally across all applications and video games. How the Scancode Map Works

Every time you press a physical key, your keyboard sends a hardware signal known as a scancode to the computer. Windows intercepts these signals in the registry at:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Keyboard Layout.

By creating a REG_BINARY value named Scancode Map, you can tell the Windows keyboard driver to substitute one incoming scancode for another (or disable a key entirely). The Registry Binary Structure

The data inside a Scancode Map is written in strict hexadecimal format using little-endian byte order (meaning the bytes are written in reverse order). The structure breaks down as follows: Header (8 bytes): Always 00 00 00 00 00 00 00 00.

Number of Entries (4 bytes): The total number of remaps you are performing plus one (for the null terminator). For example, 1 remap is 02 00 00 00, and 2 remaps is 03 00 00 00.

Individual Remaps (4 bytes per key): Written as [New Key] [Original Key].

Null Terminator (4 bytes): Always 00 00 00 00 to close the map. Example: Swapping Caps Lock to Left Control

Caps Lock (3A 00) is often remapped to Left Control (1D 00) for ergonomics. The binary data would look like this: Experts Exchange Keyboard Remapping: CAPSLOCK to Ctrl and Beyond