games dont show on my r4 card

hi, i downloaded some games for my dsi, they are showing on laptop but when i put my sd card back into my dsi, they dont appear, what did i do wrong, al my other games are .nds files, but these are .rar files, they open on my laptop with windows media player, this gives an error too, can anyone help me with what i did wrong

you have to get winrar to extract the files. after you have winrar right click on the file and pick extract here and it will give you the .nds files

nhu11you have to get winzip to extract the files. after you have winzip right click on the file and pick extract here and it will give you the .nds files

winrar not winzip