rar files?? how can you play them

hey im new to this whole roms thing how can i play a GBA rar file?

https://www.romulation.org/forum/index.php/topic,1663.0.html

You'll have to extract it with WinRAR. (Google it)Then you'll need a GBA emulator. I suggest No$Gba. (Google that as well)OR just look at the above link...