RTF file and document viewer

Hi, I am using below code var fileloc = Ti.Filesystem.getFile(Ti.Filesystem.applicationDataDirectory, filename);

fileloc.write(this.responseData);

// write to the file

viewer = Ti.UI.iOS.createDocumentViewer({ url : fileloc.nativePath });

viewer.show();

to show downloaded files using document viewer in ios .I am able to view doc,docx files.But I am not able to view contents of rtf files.

Does document viewer not support .rtf files?or any code changes required?

Thanks Param