WordPress: include presentation

I was wondering if wordpress has some feature to show presentations in ppt, odp or pdf formats inside de blog. I haven’t found anything and worse, I didn’t succeed to upload an odp file despite of succefully upload a ppt file. I received the message “File type does not meet security guidelines. Try another.” After a while I reach the faq, but I still don’t know how to change that nonsense “security guidlines” policy. Anyone got a tip?