Protractor - upload file/ running exe via protractor

I have a web site written in Angular and I'm trying to do end-to-end testing using Protractor. The website has a "add button", that opens "choose file dialog box". I want to be able add a file from protractor, but it doesn't upload the file or closes the dialog box.

I tried to create a .exe file that controls the dialog box via (autoIt) and it works fine (when the dialog box pop up i run the .exe and everything is working fine). However, I don't understand how to tell the protractor to launch an .exe after the dialog box appears.

 var path = require('path');
 it('should upload a file', function() {
     var fileToUpload = '...\folder\xxx.txt',
     absolutePath = path.resolve(__dirname, fileToUpload);
     $('#uploadButton').click();
     $('input[type="file"]').sendKeys(absolutePath);
 });

var exec = require('child_process').execFile;
var fun = function() {
    console.log("fun() start");
    exec('c:\\Upload_Nonce.exe', function(err, data) {  
        console.log(err)
        console.log(data.toString());                       
    });  
}
fun();