Ive tried 64, 32px, 24px, 16px FAVICON.png in the same DIR as the manifest file. No luck. I also tried and ICO with ever 32bit size.
package.json
{
"main": "INDEX.html",
"name": "cacluclator",
"description": "NWJS SMART CALCULATOR",
"version": "00.00.00",
"keywords": [ "SMART CALCULATOR", "INSECURITY" ],
"window": {
"title": "SMART CALCULATOR",
"icon": "FAVICON 32.png",
"frame": false,
"toolbar": true,
"transparent": true,
"position": "center",
"height": 500,
"min_height": 500,
"max_height": 500,
"width": 400,
"min_width": 400,
"max_width": 400
},
"webkit": {
"plugin": true
}
}