Stupid question, but… why? Why would’t you want let people use what ever softwear they want and have?
I just wondering myself in the situation where an excel sheet size of 402x345px with all toolbars etc is served inside of a discourse topic and I have a mobile in use. That is.. quite hard to use.
So, the main question is here what are you trying to achieve — because that dictates what the best solution is, embedding or something else.