Possible to change folder icon using app.system()? [PC/mac]

Question

I need help to verify if this works smoothly.
... If it is even possible...
#target bridge;
if ( BridgeTalk.appName == "bridge" ) {
     if ( Folder.fs == "Macintosh" ) {
          iconPath = new File("/someplace/MyIcon.icns");
          var myFolder = new Folder("/someplace");
          // select my folder and tell OSX to change the icon to MyIcon.icns
          app.system("mac command lines");
     } else if ( Folder.fs == "Windows" ) {
          iconPath = new File("/someplace/MyIcon.ico");
          myFolder = new Folder("/someplace");
          // select my folder and tell OSX to change the icon to MyIcon.ico
          app.system("command code"); // for windows7
     } else {
          alert ("Unsupported file system");

Answer 1

var f=new File(app.document.presentationPath  + "/desktop.ini");
f.open('w');
f.encoding = "UTF8";
f.writeln("[.ShellClassInfo]");
// I have chosen one icon of windows7, but you can design and create your own icon, export it to .ico and add it here, for ex: f.writeln("IconResource=c:\\Users\\Public\\myIcons\\myicon.ico");
f.writeln("IconResource=%windir%\\system32\\imageres.dll,101"); // if using dll of windows, a 2nd argument is needed to set the number of the icon (there are several possible dll libraries with hundreds of icons)
f.writeln("[ViewState]");
f.writeln("Mode=");
f.writeln("Vid=");
f.writeln("FolderType=Pictures");
f.close();
.hidden=true;
var cmd = "attrib +s  \"" + decodeURI(app.document.presentationPath) + "\"";
app.system(cmd);
// go to the parent folder to refresh and come back again:
var back = app.document.thumbnail.uri;
app.document.thumbnail = app.document.thumbnail.parent;
app.document.thumbnail.refresh();
app.document.thumbnail = new Thumbnail(back);