Creating a ppt or pptx blob from byteArray in typescript/angular 2

I need to convert my byteArray response into ppt Blob Object to create a .ppt/.pptx file in Angular 2. I am able to convert to image and pdf formats. But I need specifically for ppt and pptx formats.

var blob = new Blob(resp, {type: 'application/pdf'});

AS above, what is the type to be given for ppt or pptx conversion?

Please mention if I need to add more details.

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