Windows Data Types… why so redundant/undescriptive?

Question

Could someone please exactly why the following typedefs/#defines have been defined? What value do they have, compared to the originals?

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Answer 1

One reason is to maintain some kind of portability between C compilers.

In particular DWORD64, in theory you just need to change the definition of DWORD64 to get the code compiling on other compilers.