Yeah for some stupid reason most web servers give office 2010 documents a mime type of zip (they are zip, but loaded directly as such) so if you don't "save as" and keep the PPTX or whatever extension you end up with a zipped file instead of the proper extension.
Hi All,
We have added the rest of the talks for the Beyond Programmable Shading SIGGRAPH 2011 course. The only content missing are the panel presentation slides, which we'll try to get posted soon.