Unable to open PowerBi generated PPTX with openxml

Hi All,

I am pretty new to PowerBi services. I am currently trying to generate PPTX using PowerBi REST api from our backend service. The ppt is generated fine, I am able to open the file as well without any issues. But when I try to open the file using openxml I am getting "File contains corrupted data" exception. I tried using OpenXML VS plugin but it didn't help in figuring out what's the issue. Has any one tried and successfully modified the PPTX generated by powerbi service using openXML?