What ds r4 card game files do you need?

It seems you are asking about the files needed for a DS R4 card, but there is some missing context.

To help you find the right information, could you please clarify what you are looking for?

For example:

* What kind of game are you trying to play? (e.g., Pokemon, Mario Kart, etc.)

* What specific R4 card do you have? (e.g., R4i Gold 3DS, R4i SDHC, etc.)

* Are you looking for ROM files, or files for a specific game's save data?

Once you provide more details, I can give you a more specific and helpful answer.