Thank you!
1. there is a list of allowed files here
http://www.demo.youjoomla.com/newsli...d=11&Itemid=54
and here is about JW player
http://www.demo.youjoomla.com/newsli...d=41&Itemid=55
There is a JW player that plays mp3 you will have to visit his website to find out more
2.Why would you want to do that? Store is a component not mambot
3. We are making price list for custom works but you question is not clear. Do you need your site conversion to 1.5 or do you need us to install demo for you?