Ds games

Hi all im new to this forum and as a newbie im going to ask a question and forgive me if its one you get all the time.
I have downloaded some Ds games off the site and saved them on my pc but when i try to load them on my R4 they are showing up as RAR files and wont play! :-\
Do i need some software or a file to make them work?
I already have a lot of games which my friend downloaded for me but i cant ask him as he,s on holiday for a few weeks.
Hope someone can help.Thanks

You need to extract them, so that you get .nds files. Go to the Winrar tutorial in the Tutorials section on this Forum.