Just because a particular browser will work with some things doesn't mean that it will work with them all. This goes back years as far as secure connections are concerned.
I tried to open few of archived html files I have got no problem,,,I do not why !!!

I have changed file association from Firefox to opera then I reopened those archived html files I have got no problem.

But still I am experiencing problem with yahoo!!! right now yahoo is opened with Firefox do I need to change that to a different browser if so how can I do that ?

Thanks