Function int WritePrivateProfileString (readonly String sectionName, readonly String keyName, &
    readonly String keyValue, readonly String fileName) & 
    Library "kernel32.dll" alias for "GetPrivateProfileSectionW"

li_ret = WritePrivateProfileString('Test', 'test', 'test', '.\test.ini')

int ret = WritePrivateProfileStringW(L"Test", L"test", L"test", L".\\test.ini");