Help req'd Plz.

Beginner,, got probs downloading ds games.
Why when sizeof download is 15mg and I then extract files, is the mg increased sometimes to 90 or 100mg?. Also after downloading to r4 card chip, does the game appear on the chip on the p.c but when placed in the ds the game doesnt seem to be there? Any help gratefully appreciated. Hav a good wknd. Dj.

are you putting the rar file on the r4 chip or the .nds rom on it and rar files i think are able to compact the size so it easyer to transfer

The reason the games are in a .rar file is to compress them, to save space, so the contained file is larger, yes.
And the file you're putting on the chip (MicroSD card), does it end with ".nds" ?