RAR files?

Hi. ,ive only ever had the games that were on my R4 when I bought it, but Ive just downloaded a couple of games onto my R4 from here inc Harry potter and some imagine games.. but they are showing on my list as RAR files, rather than NDS files.. and then when I tried it on my DS lite the games dont show on the list.. one game that I downloaded does work (donkeykong) but this is an NDS file also.
anyideas how to make the RAR files compatible?ThanksHelen

?You must open the winrar files and grab the .nds file inside.winrar or 7zip work best-some prefer 7zip as no annoying prompts-other's say winrar.Google ethier one-they are free-winrar claims it's not but the "demo" can last forever depending on sorce.

You have to extract the contents of the RAR in order to get the NDS file inside it. :DThere's a great tutorial made by Almo here. :)