Add .docx or xlxs or .txt file upload functionality

Hi ,

Thanks for the plugin solved a major part of my problem. But for the ease of uploading the keywords I want to add a functionality to upload the .txt or .Docs or . xlxs file to import the keywords to the text area instead of directly copy pasting the keywords . Can you please help me with the modification to be done to achieve this .

Please refer Linkify text. Details

Thanka