Solution
Use the KEY_WOW64_64KEY flag
RegCreateKeyExW(hKey, subKey.c_str(), 0, NULL, REG_OPTION_NON_VOLATILE, KEY_READ | KEY_WOW64_64KEY, NULL, &hKeyOut, NULL);
Use the KEY_WOW64_64KEY flag
RegCreateKeyExW(hKey, subKey.c_str(), 0, NULL, REG_OPTION_NON_VOLATILE, KEY_READ | KEY_WOW64_64KEY, NULL, &hKeyOut, NULL);