My professor has provided a link to download power point slides and I seem to be having an issue. It will download the content and when I open the file it asks me which program I would like to use to open it. I've gone through numerous programs and they all keep telling me that it's not a supported file type or the file has been damaged? I e-mailed my professor and was told the other students have not had a problem. Is there something I am doing wrong?