. It will then open a window where you have to navigate to where your Wii U Mod is located...
If not, do this. Find any page online with the game you want to mod. Then, on your web browser, press F12 or Ctrl+Shift+I to open developer tools/inspect element. Then, switch to the console tab in the developer tools. In the console tab, go to the search bar, and type "swf"...