The browser I use treats files found on the local machine as more trusted and gives it more privileges. In general, I don't just take a random .htm file given to me and open it in my web browser. Who knows where that .htm has been?
It's like me handing you a .EXE file and saying "just run this so you can see the problem on your machine".
It's just not a safe computing practice.
This post has been edited by Skydiver: 20 July 2012 - 10:14 AM