zgrf ~master (2021-10-23T08:59:37Z)

GRFHeader.encryption

Either [0x00, 0x01, 0x03, ..., 0x0C, 0x0D, 0x0E] => Use Mixcrypt or [0x00, 0x00, 0x00, ..., 0x00, 0x00, 0x00] => Not encrypted

struct GRFHeader

ubyte[15] encryption;

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