~1. You must it convert like paul1991 said.
~2. Example:
- You've started zelda.nds
- ~ You've decided to take a sav file from the web, so youve turn off your DS
- After turn off your DS the actual Sav file will be stored in SRam
- If you now use the USB mode and copy another zelda.sav file to the DS
- And start the zelda game again, your new save file would be overwritten by the save in the SRam.
So everytimes you want to copy another sav file to the NCard, you must first clear the SRam by starting another game, than the one you want to change the sav file.
(Lol, why Im posting this? = Because last week I've tried to HEX a bit on an save and everytime I've started the Rom the last sav file from SRam has been replaced -_____- )