A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
No idea when it was changed. I tested in Powerpoint 2013 and the way you found, the embedded file is .xlsx,
I have version 1708 Build 8431.2215 and in this, I get the same oleObject.bin for embedded files.
To extract it MSDN has published some code which requires knowledge of .NET. If you know .NET, then you can extract.
https://code.msdn.microsoft.com/CSOfficeDocumen...
In my opinion, it is a right change as people should not be able to extract like this. Microsoft should also plugin the zip hack to open its office files.
Thank you for the link and explanation. I don't think this will help though as we need to be able to actually parse the content of the embedded files, change them and then put them back. I'll check with our development team but this doesn't look as though it will support this process.