The trouble with BeIE is that, no matter how I tried, it would not agree to open a file that you click on in file browser. The only way to use it is to either type in the path to file directly in location bar, or to make a file with links and use it as a start page. Either way is clunky, to say the least..
There is no way to browse for a local file, either. In fact, the only reason to use BeIE is that it shows code in web pages normally, unlike Internet, which inserts a space between every letter (as you can imagine, that makes it almost impossible to read).