Protractor - upload file/ running exe via protractor

i have a web site written in angular and i'm trying to do E2E testing Using Protractor

my web site have an "add button" , that opens "a windows OS choose file dialog box" i want to add a file tried using this code :

 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);   

but it don't upload the file or closes the dialog box . anyone have an idea ?

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 eorking fine ... BUT . . . i don't understand how to tell the protractor to lunch an exe after the dialog box apper ... i tried using this code :

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(); 

i failed with both ways ... can anyone help me out ?

thanks Oded