Step 1: Install Dolphin to retrofe\Dolphin\
Step 2: @ command prompt issue command core\RetroFE.exe -createcollection "Nintendo Wii" This will make a folder named (WII) and generate folders and config files.
core\RetroFE.exe -createcollection "Nintendo GameCube"
Step 3: navigate to retrofe\collections\Nintendo Wii\settings.conf and Nintendo GameCube\settings.conf and replace with
Wii
# Uncomment and edit the following line to use a different ROM path.
#list.path = %BASE_ITEM_PATH%\%ITEM_COLLECTION_NAME%\roms
list.path = D:\Nintendo Wii\roms
list.includeMissingItems = false
list.extensions = iso
list.menuSort = yes
launcher = Dolphin
metadata.type = Nintendo Wii
Game Cube
# Uncomment and edit the following line to use a different ROM path.
#list.path = %BASE_ITEM_PATH%\%ITEM_COLLECTION_NAME%\roms
list.path = D:\Nintendo GameCube\roms
list.includeMissingItems = false
list.extensions = iso
list.menuSort = yes
launcher = Dolphin
metadata.type = Nintendo GameCube
Replace D:\Nintendo Wii\roms and same for D:\Nintendo GameCube\roms with your roms directory
Step 4: make a retrofe\launchers.windows\Dolphin.conf and insert executable = emulators\Dolphin\Dolphin.exe
arguments = -b --exec="%ITEM_FILEPATH%"
Step 5: Open Dolphin directly and go to Options>>Interface Uncheck Confirm on stop (this will close Dolphin without conformation when escaping back to Retrofe Menu)
Next Options>>Graphics Settings and check Use Fullscreen.
Add Nintendo Wii, and Nintendo GameCube to your retrofe\collections\main\menu.txt
And Done.