g++ 4.8.1 (mingw) - setting registry keys

build.bat

windres reg.rc -O coff -o reg.res
g++ -c reg.cpp
g++ -o reg.exe reg.o reg.res

reg.cpp

#include <windows.h>
#include <string>
#pragma GCC diagnostic ignored "-Wwrite-strings"

HKEY OpenKey (HKEY hRootKey, char strKey[]) {
    HKEY hKey;
    
    LONG nError = RegOpenKeyEx (hRootKey, strKey, 0, KEY_ALL_ACCESS, &hKey);
    
	if (nError == ERROR_FILE_NOT_FOUND) {
        RegCreateKeyEx (hRootKey, strKey, 0, NULL, 0, KEY_ALL_ACCESS, NULL, &hKey, NULL);
    }
    return hKey;
}
 
void SetVal (HKEY hKey, LPCTSTR lpValue, char data[], int lol) {
    RegSetValueEx (hKey, lpValue, 0, REG_SZ, (LPBYTE)data, lol);
}
 
int main()
{
	HKEY templ = OpenKey(HKEY_CLASSES_ROOT, ".");
	HKEY handler = OpenKey(HKEY_CLASSES_ROOT, ".0069");
	HKEY handler2 = OpenKey(handler, "ShellNew");
	HKEY handler3 = OpenKey(handler2, "Config");
	
    SetVal(templ, "", "Empty file", 10);
    SetVal(handler, "", ".", 1);
    SetVal(handler2, "NullFile", "", 0);
    SetVal(handler2, "IconPath", "%SystemRoot%\\System32\\imageres.dll,2", 38);
    SetVal(handler3, "NoExtension", "", 0);
    
    return 0;
}

reg.exe.manifest

<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0">
    <assemblyIdentity
        version="1.1.1.1"
        processorArchitecture="X86"
        name="reg.exe"
        type="win32" />
    <description>what does it matter</description>
    <trustInfo xmlns="urn:schemas-microsoft-com:asm.v2">
        <security>
            <requestedPrivileges>
                <requestedExecutionLevel level="requireAdministrator" uiAccess="false" />
            </requestedPrivileges>
        </security>
    </trustInfo>
</assembly>

reg.rc

#include "winuser.h"
1 RT_MANIFEST "reg.exe.manifest"