(TXT) nsCExternalHandlerService.h
 (TXT) nsExternalHelperAppService.h
 (TXT) nsExternalProtocolHandler.h
 (TXT) nsHelperAppRDF.h
 (TXT) nsIExternalHelperAppService.h
 (TXT) nsIExternalProtocolService.h
 (TXT) nsOSHelperAppService.h