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In that platform, a dword designates a 32-bit (4-byte) unit. Similarly qword (quadruple word) is a unit of data that is four times the size of a word. On the x86 platform, this unit of data is 64 bits long because the definition of word on an x86.
So, really, a DWORD on modern computers should be 128 bit! However, for 'backwards compatibility reasons', the size of each has stayed the same. So, the WORD type is 16 bits, even though it technically should be 64 bits, like a computer word.