property type

(r/w) string type;

Typ

Zugriff

This property contains the mime type of the attached stream. 
var fileStreamObj = shell.serviceManager.basics.fileStream;
var streamReaderObj = shell.serviceManager.basics.rawStreamReader;

fileStreamObj.openForRead("c:\\temp\\test.txt");
streamReaderObj.stream = fileStreamObj;
streamReaderObj.seekRelative(4);

var type =  streamReaderObj.type;

fileStreamObj.close();