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View Thread: TechEd Amsterdam 2012
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    They should be pptx files. If you have a .zip file containing a _rels, docProps and ppt dir and a [Content_Types].xml in the root, you can rename the .zip to .pptx. If you don't have PowerPoint you can download the viewer from

    Good luck,


    edit: maybe your unzip app recursively unzips all zip files inside the zip file, a.pptx file is in fact a zipped file