How to extract the comments part of a ppt\pptx file to a data base

I'm building an Android app that's reads comments from an MS Power Point file. As i get it ill have to use some API, or build 开发者_如何学编程a program in C#. The problem is that i can't find a way of doing that. I would like to hear some suggestions or to hear from programmers that accomplish that, or something similar.

If you can use the power point api that would be the best way however I don't know if that available on android. This is a link to the binary file specification for ppt files.