typedef void (*SilcClientFileAskName)(SilcClient client,
                                          SilcClientConnection conn,
                                          SilcUInt32 session_id,
                                          const char *remote_filename,
                                          SilcClientFileName completion,
                                          void *completion_context,
                                          void *context);

    File name asking callback that is called if it is given to the
    silc_client_file_receive and the path given to that as argument was
    NULL.  The library calls this to ask the filename and filepath to
    where the file is to be saved.  The 'remote_filename' is the file
    that is being downloaded.  Application must call the 'completion'
    with 'completion_context' to continue with the file downloading.
    It is not mandatory to provide this to the silc_client_file_receive.