diff --git a/package.json b/package.json
index 7eed0556b..4b46cc894 100644
--- a/package.json
+++ b/package.json
@@ -21,11 +21,12 @@
         "grunt-curl": "0.5.0",
         "grunt-shell": "0.2.1",
         "q": "0.9.2",
+        "adm-zip": "0.4.4",
         "semver": "2.0.11"
     },
     "scripts": {
-        "preinstall": "bash -c 'mv appshell.gyp .appshell.gyp'",
+        "preinstall": "node -e \"var fs=require('fs');var n='appshell.gyp';fs.renameSync(n,'.'+n);\"",
         "install": "",
-        "postinstall": "bash -c 'mv .appshell.gyp appshell.gyp;'"
+        "postinstall": "node -e \"var fs=require('fs');var n='appshell.gyp';fs.renameSync('.'+n,n);\""
     }
 }
\ No newline at end of file
diff --git a/tasks/setup.js b/tasks/setup.js
index 1bacf1f5f..42e59fb4b 100644
--- a/tasks/setup.js
+++ b/tasks/setup.js
@@ -21,7 +21,7 @@
  * 
  */
 /*jslint vars:true*/
-/*global module, require, process*/
+/*global module, require, process, setTimeout*/
 module.exports = function (grunt) {
     "use strict";
 
@@ -30,6 +30,7 @@ module.exports = function (grunt) {
         child_process   = require("child_process"),
         path            = require("path"),
         q               = require("q"),
+        AdmZip          = require('adm-zip'),
         /* win only (lib), mac only (Resources, tools) */
         CEF_MAPPING     = {
             "deps/cef/Debug"        : "Debug",
@@ -64,7 +65,17 @@ module.exports = function (grunt) {
     
     function unzip(src, dest) {
         grunt.verbose.writeln("Extracting " + src);
-        return exec("unzip -q " + src + " -d " + dest);
+        var deferred = q.defer();
+        var zip = new AdmZip(src);
+        setTimeout(function() {
+            try {
+                zip.extractAllTo(dest);
+                deferred.resolve();
+            } catch(err) {
+                deferred.reject(err);
+            }
+        });
+        return deferred.promise;
     }
 
     // task: cef
@@ -317,6 +328,8 @@ module.exports = function (grunt) {
         
         if (platform === "linux") {
             gypCommand = "bash -c 'python2 gyp/gyp --depth=.'";
+        } else if (platform === "win") {
+            gypCommand = "cmd /C \"gyp\\gyp appshell.gyp -I common.gypi --depth=.\"";
         } else {
             gypCommand = "bash -c 'gyp/gyp appshell.gyp -I common.gypi --depth=.'";
         }