I tried that for ACWW and NinjaTown and it didn't work. Ex. NinjaTown.nds NinjaTown.sav (512kb, 9th selection on Shuny Sav converter target format) Files located on MicroSD card.
EDIT: 2nd try, fail: NinjaTown.nds NinjaTown.sav (512kb, 23rd/last selection on Shuny Sav converter target format) Files located on Desktop.