REST API Compare Viewpoints and write to file

Summary:

REST API Compare Viewpoints and write to file works as expected but the resultant file is a Xl and how to download the Xl as is? There is a download file for other EPM Suite of products where we download TXT and CSV easily as is but the same or the staging file download does not work straight forward for Xl? How to download this from REST? PS: do not want to use cURL or EPM Automate download file