Hi Shivkanwer,
Thank you for your interest in Syncfusion products.
At this moment we do provide support to view/edit formatted rich-text content
from rich text format (.rtf) files, Word documents (.doc, .docx) and text files
(.txt) in Windows Store apps using WinRT SfRichTextBoxAdv control. Kindly refer
to Document Editor and RichTextEditor samples in our WinRT sample browser.
For more information regarding the edit functionalities of SfRichTextBoxAdv please
do refer our UG documentation from the following link.
UG Documentation link:
http://help.syncfusion.com/UG/winrt/default.htm#!Documents/overview21.htm
Please let us know if you have any other questions.
Regards,
Gunasekaran