HKEY hKey;
    DWORD result = RegCreateKeyEx(HKEY_LOCAL_MACHINE,
                                "SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\App Paths",
                                0,
                                NULL,
                                REG_OPTION_NON_VOLATILE,
                                KEY_SET_VALUE,
                                NULL,
                                &hKey,
                                NULL);
    if( (result != ERROR_SUCCESS) || (hKey == NULL) ) {
        report_error("RegCreateKeyEx", result);
    } else {
        TCHAR exectutable_path[MAX_PATH];
        DWORD path_length = GetModuleFileName( NULL, exectutable_path, MAX_PATH );
        if( path_length == 0 ||  MAX_PATH <= path_length ) {
            report_error("GetModuleFileName");
        } else {
            LONG result = RegSetValueEx(hKey, "My program", 0, REG_SZ, (LPBYTE)exectutable_path, path_length);
            if( result != ERROR_SUCCESS ){
                report_error("RegSetValueEx");
            }
        }
        LONG result = RegCloseKey(hKey);
        if( result != ERROR_SUCCESS ){
            report_error("RegCloseKey");
        }
    }
    TCHAR path[MAX_PATH];
    DWORD path_length = GetCurrentDirectory(MAX_PATH, path);
    if( path_length == 0 || MAX_PATH <= path_length ) {
        report_error("GetCurrentDirectory");
    } else {
        std::cout << "Current path: '" << path << "'" << std::endl;
    }