Hello pradababe, welcome to Talk3G. Suggest you "do a google"
and see what comes out of the enquiry. I just ran one for "AMR Player" and one of the first was this link http://www.freedownloadscenter.com/B...mr-player.html which may do what you want. If it doesn't then there are dozens more. Shouldn't be difficult finding one to suit you.
Hope this helps.