Custom Permalinks Plugin Help

Hi, ive been searching for a sulution for my problem, im using custom permalinks plugin to recreate page for the domain ive bought…I want to recreate a page like >> http://domain.com/comment.asp?shopId=144939

but the custom permalinks plugin is creating like http://domain.com/comment.asp%3FshopId%3D144939 ..and its giving me a 404 error.. any help will be appreciated..

thanks,

Chad