Well I've tried both ZipArchive and the Writer Factory. Both can be unzipped by SharpCompress and Windows but not by Office. If PowerPoint is open when I point it to the .ppsx it offers to repair the file which it can do. If I use the file to launch PowerPoint it flat out refuses. I've been trying to research more on Office Open XML but the spec only mentions standard zip technology. I've come across one comment on the web stating ZIP64 or base 64 however. That might mean more to you than me. System.IO.Compression.ZipArchive does the job for a Metro app so I'm not sure what is different.
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