Loading icons windows

If you are using these images as icons in your ScriptUI panel, I would recommend converting them to binary strings at first and then applying those in code. Here's a small example:

(function(){
    var win = new Window("dialog", "script");
    var cameraImg = "\u0089PNG\r\n\x1A\n\x00\x00\x00\rIHDR\x00\x00\x00H\x00\x00\x00H\b\x03\x00\x00\x00b3Cu\x00\x00\x00\u0081PLTE\u00FF\u00FF\u00FFJJJ\u00F7\u00F7\u00F7\u00C8\u00C8\u00C8NNN\u0080\u0080\u0080\u00EE\u00EE\u00EEyyy\u00F3\u00F3\u00F3ddd\u00A4\u00A4\u00A4LLL\u00D3\u00D3\u00D3WWW\u00DC\u00DC\u00DC\u00D9\u00D9\u00D9\u009A\u009A\u009Appp\\\\\\\u00A1\u00A1\u00A1VVV\u00FC\u00FC\u00FC\u00EB\u00EB\u00EB\u00E1\u00E1\u00E1\u00A7\u00A7\u00A7lll\u00F9\u00F9\u00F9\u00CE\u00CE\u00CE\u00C2\u00C2\u00C2\u00A0\u00A0\u00A0\u009F\u009F\u009F\u0096\u0096\u0096\u0087\u0087\u0087___RRR\u00CD\u00CD\u00CD\u00AB\u00AB\u00AB\u0083\u0083\u0083}}}\u00AD\u00AD\u00AD\u0091\u0091\u0091ttt\u00B0\u00B0\u00B0\u0089\u00B5\u00C9\u00E1\x00\x00\x01\u0083IDATX\u00C3\u00ED\u0096\u00E9r\u00820\x14F\u00EF\x07a\u0093\u00ADl\u008A\u008A\u008A\u00BB\u00F6\u00FD\x1F\u00B0\x0E\u009DB\x01c\u0082Lu\u00A6\u0093\u00F3/\u00DCpHHroH\u00A1P(\u00FE\u0096Eqd\u00A8a\u00C7b\u00F1\u009CG\u00BB\u00A2\u00C3U{Jt\u0081\x7F^\u00FC\x1A\u00DF\u00D9\u00C7\u0085\u00A4\u0098\u00E0\u009BI\u00D5\u009A\u00BAl\u00D6\u008E\u00CF\u0098;\u0095\x12\u00E1\u0087\u00AA\u0095\u00A3\u00A4\x0E%r\x12\u0093\x15@\u00DB\u00B7\u00A7\x0E{\u00DC\u0088\u008D\u00DC|\u00E4\u00F1\x1C\u00E0\u00D8\u009AaI=JT\u00A4:\u00DF\u00B3wa\x15\x19I`\u00EA\x06\\\u00AE\u00C9\u008E\u00F1I\u00D2\x1C\u00E0\u00DB\u009CP\x0E\u00E3~`\u00AAO\u008C86&zk\u00BDNH8\u00A29<\u00A2e\x14-\u00A9Eh\u00A1\u00C6\n\u00A9\u00C6\u0083\u00C3\x111hD\x0E\u00DAqm\x03\u00A4\u00B7\u00C1\u0098\u00E6mX)\u00B0\u00D1\u00EA\b\x18w\x0BQOdG`\u00AB\u00E6\u00DD\x15Cd7\u00FD\u00F9\u00A2\u00EE\u00D42\x0B\u00CE\u00AC\u00B5\u00B1\x1DX\u0099\u0084\u00A8K\u0082\u00AD\u00D9Y\u00F8-\u0092\u00E1\u00A2\u00C0e!u\b\u0099\x1B\f\x16YXS\u008F5\u00AC\u00A1\u00A2\x00\u00BEF=4\x1F\u00C1@\u00D1\x07>\u00A8\u00A2\u00F7X,\u00EA\u00EF\u00D0>\x1E\u00E6\x03E;\u00D8w\u00CF$v\x03E\x00\u00AF\u00E3\u00ABE\u00E2\u00A9\u00BD\u00FAg\u008B\u0097\u00FF=\x1BR|D\u00C6\x1F\u00DA\u00F7\u00A5\u0091\u00F1\u0089m|\u00AA\u00AD\x10$\x7F\u00A1\u0088\u00A1\u00EE$(G\u0082*\u00E2\u00C0\x13\x17H\u0099\u00BA\u0096\u00E0D\x02\u00E4*\u00AD\u00ED\u00E30\u00A6\u00F67\u00E8.\f\u00DD\x1Cq\x1BiL)\u00A4I\u00F5\u0087_\u00CA\u008D\x18\x02\u00EA\x1B\u009BB\u00A1P\u00FCs\u00BE\x00g\u00E7\x12\u0097\x1B\u00EF*\x01\x00\x00\x00\x00IEND\u00AEB`\u0082";
    var btn = win.add("iconbutton", undefined, cameraImg);
    win.show();
})();

I wrote this script some time ago that takes bunch of files and converts them to binary strings. AE Script: Export to Binary String — Bitbucket  It works for both Photoshop and After Effects. Should probably be able to run on Illustrator, but I haven't tried it yet.

Simply launch this script, select your images, copy/paste binary strings to your code and you should be golden.

This will avoid distributing your physical image files and will save you time and headache in case end user will remove those images from hard drive.

Hope that helps.

For windows if I want to put in in the PS scripts folder, I use:

var file = new File (app.path + '/Presets/Scripts/myImage.png');