As the name suggests, Cemu Loader is a game loader for the Wii U emulator Cemu.
This App requires NW.js:
Download lastest normal version of NW.js (https://nwjs.io/)
Unzip content in "C:\Program Files\nwjs"
Double click on the application (.nw file)
Select "nw.exe" from "C:\Program Files\nwjs" as default reader for "*.nw" files