How do i translate languages in Microsoft word 2007?

I received an email attachment in Bengali and i want to read it in Bengali. The problem is when i open it with MS word it turns out to be a bunch of English gibberish with numbers. Someone help me open this document with some sort of software or translator. It would be more preferred if you can show me how to set my MS word 2007 language to Bengali. thank you.|||Try The yahoo translator Babel FIsh