There is no 32-bit WORD. That's called a DWORD

[danielmarschall]

I noticed that I can't build sha256.c and sha256.h in Windows, because WORD is redefined with different data types.

There is no 32-bit WORD. A WORD is always 16-bit, and a DWORD would be 32-bit.

~~To fix this issue:~~

~~Change~~ typedef unsigned int WORD; // 32-bit word, change to "long" for 16-bit machines

~~To:~~ typedef unsigned long DWORD;

~~Then, change all WORD to DWORD in the code.~~

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This does not only affect SHA256, but most of the other files too.