Retrieve the default user locale on Windows

get_user_default_locale.c

#include <windows.h>
#include <stdio.h>

void main() {
	char locale_name[32];
	if (GetLocaleInfo (LOCALE_USER_DEFAULT,
		LOCALE_SABBREVLANGNAME | LOCALE_USE_CP_ACP,
		locale_name, sizeof (locale_name)))
	{
		printf("%s\n", locale_name);
	}
}