FileType data for class Id registration.
Mask (HexType, required) : Hex value that is AND'd against the bytes in the file at Offset.
Offset (Integer, required) : Offset into file. If positive, offset is from the beginning; if negative, offset is from the end.
Value (HexType, required) : If the result of the AND'ing of Mask with the bytes in the file is Value, the file is a match for this File Type.