Might I assume that you're dealing with a goodmerged set? If so there are 3rd Party tools found at the Cowering's GoodTools site that can help with this. One that comes to mind is UnGoodMerge. There are options in GameEx to filter out the roms you want listed but since you want them removed from memory then that might not be the way you want to go but it is an option. Another suggestion might be to rebuild your set to the no-intro format and can use their site to generate a dat for you with the filters you want. But to answer the question, yes, GameEx deals with .7z files. It is a registered feature and is one of the few frontends that does this. I personally would go this route. But to each his/her own. There are so many options in this case so you must decide what you want to do first and then go from there. We can help you get the results you want once you make that decision. Confusing huh? LOL. Sorry!