Url rewriting plugin Q&A

Hello,

I use your plugin Q&A .

Actually, the url of the page question is :

http://www.mywebsite.com/questions/title-of-the-question

I want add that ".htm", like this :

http://www.mywebsite.com/questions/title-of-the-question.htm

How can i do that ?

P.S : directly in permaliens, it's not possible because your plugin q&a generate an other kind of url.

Thank you in advance