I'm guessing you want to dump your save and use it on your emuMMC/emuNAND? What exactly are you trying to do? The save data isn't inside of an NSP, save data is associated with a title ID which will be the same whether you're playing with an installed NSP or gamecard.
That being said, if you are indeed wanting to export a save from your sysMMC/sysNAND that would mean booting CFW on your system, which can land you a ban UNLESS you NAND backup right before, be sure you're in airplane mode and then restore the backup after you export your save.
If you download an NSP or XCI it won't have any of that information or it will have bogus data anyway. Just dump your own gamecard and save yourself the trouble.
PM me if something isn't clear or you have more questions.
