I ran my typo.pl perl script that locates possible C/C++ typos.

I found four that looked valid.

Two of the typos were in the Python directory {pythonrun.c, 
dynload_win.c}, two were in PC/bdist_wininst {install.c, extract.c}.

Python/dynload_win.c:
Win32 API FormatMessageW() expects the 6th parameter to be the count of 
characters, NOT the count of bytes.

Python/pythonrun.c:
The source code contains "if (ferr != NULL || ferr != Py_None)". This 
does not work as expected - if ferr == NULL, then the second part of 
the if expression will succeed. Look at the code handling fout about 8 
lines up to see the correct code.

PC/bdist_wininst/extract.c:
Win32 API CreateFileMapping returns NULL on error, not 
INVALID_HANDLE_VALUE.

PC/bdist_wininst/install.c:
Win32 API CreateFileMapping returns NULL on error, not 
INVALID_HANDLE_VALUE.