MSI Afterburner trivially obfuscates a couple config/definition files in their program folder used to define different models and the such.

At a high level:

  1. Generate the CRC32 of MSIAfterburner.exe
  2. Use said CRC32 hash as the initial seed
  3. XOR a byte then rotate.

Roughly:

def rolling_xor(data, initial):
    state = initial
    result = bytearray(data)
    for idx in range(len(result)):
        # XOR with current keystream byte
        result[idx] ^= state & 0xFF
        
        # Update keystream state
        rotated = ror32(state, idx % 32)
        state = (idx + rotated) & 0xFFFFFFFF
    
    return bytes(result)

The unobfuscated file should start with ; and a 3 letter extension such as OEM or DAT.

Have fun.