Once your images are in the correct folder, you must tell the emulator to display them: How to Add Rom Cover Art to SNES9x on Wii?
For the best visual results and compatibility within the Wii's menu interface, your images should adhere to these technical specs: Dimensions: 316x224 pixels Bit Depth: snes9xgx cover art
SNES9xGX only supports PNG. JPG or BMP files will be ignored. Convert all images to PNG using a converter tool. Once your images are in the correct folder,