Suggestion to use WinAPI typedefs for signed integer types

Currently winapi types are being used for mostly unsigned types (BYTE, WORD, DWORD).
These are defined in WinDef.h, the project files also are including [WinNT.h](https://github.com/Alexpux/mingw-w64/blob/master/mingw-w64-tools/widl/include/winnt.h) which defines the following types:

```
/* Define the basic types */
#ifndef VOID
#define VOID void
#endif
typedef VOID *PVOID;
typedef VOID *PVOID64;
typedef BYTE BOOLEAN, *PBOOLEAN;
typedef char CHAR, *PCHAR;
typedef short SHORT, *PSHORT;
#ifdef _MSC_VER
typedef long LONG, *PLONG;
#else
typedef int LONG, *PLONG;
#endif
```
(note the use of "BOOLEAN" for 8 bit unlike the 32 bit "BOOL")

and was probably available at the time at least of v1.09b.

This would read well along with, and be consistent with the unsigned types already in use.

edit: my suggestion also includes the use of "VOID".

Locate the project files that currently use BYTE, WORD, and DWORD, then compare their declarations with the WinDef.h and WinNT.h definitions referenced in the issue. Update the signed integer types and VOID usage for consistent WinAPI naming, and verify that the affected code still builds with the intended Windows headers.

Written by the indexing model from the issue text.