If you’ve done everything correctly, restart the emulator. The flat text list should now display box art next to each entry.

The "Mod" requires specific image files to display the art. The emulator usually looks for these images based on the filename of the ROM.

Here’s a clear write-up on installing the cover art mod for Snes9x GX, the popular Super Nintendo emulator for the Nintendo Wii.

Important naming rule:
The cover image file must match the ROM filename exactly, except for the extension.
Example:
ROM: Super Mario World.sfc
Cover: Super Mario World.png

For best results, use lowercase .png files and avoid special characters.

Insert your SD card into your computer. Ensure the directory structure is correct. If any folders don’t exist, create them manually.

SD Card Root/
├── apps/
│   └── Snes9xGX_CoverMod/
│       ├── boot.dol          (the Cover Mod file)
│       ├── meta.xml          (optional – from original Snes9x GX)
│       └── icon.png          (optional)
├── snes9xgx/
│   ├── roms/                 (place your SNES ROMs here)
│   ├── covers/               (place cover art images here)
│   ├── saves/                (auto-created for save states)
│   └── settings.xml          (auto-created on first run)
└── snes9xgx.conf             (optional config file)

For the emulator to find the images, the folders must be named correctly. The emulator looks for artwork in a specific subfolder structure.

If you already have the standard Snes9x GX installed, you can replace its boot.dol or install the cover mod alongside it by using a different folder name (e.g., snes9x_cover).

The "cover mod" for Snes9x GX isn't an official feature of the standard emulator. Instead, it refers to a custom-modified version of Snes9x GX that adds box art cover support to the ROM selection screen. Below is a general guide for installing and setting it up.