I can't get Ninja Town working

when i downloaded it i added it straight into my flashcart, but when i went on it the icon doesn't show up, neither does the file, then i was checking if anything could be wrong with the file, and i assumed it's because it's a WinRAR Archive, is their anyway to change it into NDS file, and if that's not the case can someone please tell me why isn't it working, or better yet a solution to this problem, also I'm using a Dstt.

You need to extract the .nds file from the .rar file. See the Winrar tutorial in the Tutorials section.

yeah but when i downloaded it, it wasn't in a zip file it was just an ordinary file, so i didn't have to extract it.

WinRAR archives need to be extracted with WinRAR. WinZIP won't work.