[sliverr7x]

I need some help this is the only rom I am having trouble with trying to open it... When I dl it I have to extract it from rar to zip and usually when you click on the rom you can open it to get the update utility.. but whetever I do it just keeps coming up as nbh file and wont open... Anybody with a few ideas would be great been itiching to try this rom out..... Thanks..