how to convert rar files to nds files

im new to this so i downloaded a game and its a rar file it wouldnt play it on my ds..
am i suppose to convert it to a nds file, those are the only files that work on my ds...how does this work.. ???

You extract the .nds file from the .rar file. It's a compressed archive or whatever. You probably need to download a program to extract it such as... If I'm allowed to list them... Winzip, Winrar, 7zip, etc.

winzip cannot open rar files. Other than that you are correct.

Awesome advice guys, finally got the R4 working using the tip off Shiko99.
Many thanks for all your help and hope you all had a good New Years day.
Cheers again - much appreciated.

For the record. We have a tutorial on rar here: https://www.romulation.org/forum/index.php/topic,3880.0.html