int  initSave(char ***mime_types, int *nrtypes, float **prefs);
  int  openSave(const W3ADocumentInfo info,  Widget  window, long id);
 int writeSave(long id, const char *buf, size_t nchars);
  int  closeSave(long id);
 void eventSave(long id, long sourceid, long eventtype, void *params);
  int  infoSave(long id, W3ADocumentInfo *info);