I am not a tecchie so please note this when replying. I have currently 3 pdf files that are downloadable on my site via email before download. I have added another file/page but it is a .ppsx file. However when I test download the whole file corrupts when it displays in the browser. But I don't understand this since according to WordPress here http://en.support.wordpress.com/accepted-filetypes/ it is possible to upload a variety of file types for download. So why is my file corrupting?