how to use the roms..

Hi all,I'm new and don't have a clue anymore how to use the downloaded nsd roms.
I know how to download them, but I can't open them with 7-zip or winrar.Can someone help me? My kidss would be very happy.... ;D :D ;)

If you don't know how to utilize WINRAR, read: http://www.win-rar.com/faq.html?&L=0As to running the extracted .NDS rom, basically you've to either;
1. Buy NDS/DSi/3DS handheld + flash cartridge
2. Download NDS emulator depending on your system; Windows PC can use DeSmuMe or No$GBA, Android can use Drastic, etc.Of cause for no.2, emulators are fully dependent on the hardware it is running on. There are other related things to know.

Thank you very much!!
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I figured out how to play them on my pc, thanx.but....how do i play them on my nds??
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i have the firmware..

to play games on your nds, you will need a flash cart....there is a forum section on everything info you need there.