: Locate the .mcr file in the old emulator's "memcards" folder.

Because they are both "raw" 1:1 copies of a 128KB memory card, they are technically the same . Method 1: The Quick Rename (Easiest)

If renaming doesn't work or you need to manage individual save blocks, use MemcardRex , a dedicated memory card editor. Open the file : Launch MemcardRex and go to File > Open . Select your source file. Export/Save As