Currently, Flutter on Windows determines the default locales to assign to the platform configuration based on the value obtained by calling GetThreadPreferredUILanguages. This does not necessarily return the actual languages listed in the "Preferred Languages" setting. We should get the full list of preferred languages to use for application locales.

We can achieve this by querying the registry with

RegGetValueA(HKEY_CURRENT_USER, "Control panel\\International\\User Profile", "Languages", RRF_RT_REG_MULTI_SZ, NULL, str_buffer.data(), &buffer_size)

If this fails, we can fallback to the current implementation.