To get the .nds file, you simply need to it using an archiving tool. Best Software for "Converting" (Extracting)
: If your emulator (like DeSmuME or DraStic) supports compressed files, you might not need to extract it at all. Check your emulator's documentation. Direct Conversion : You cannot "convert" a generic document or image into an file is specific software code for the Nintendo DS console Are you trying to play this file on a PC emulator physical flashcart How to Convert 7Z to NDS Online (Simple Guide) 3 Sept 2023 — 7z to nds converter