Use administrator power to install Atom on Windows.

build/package.json

@@ -30,6 +30,7 @@
     "rcedit": "~0.1.2",
     "request": "~2.27.0",
     "rimraf": "~2.2.2",
+    "runas": "~0.3.0",
     "unzip": "~0.1.9",
     "vm-compatibility-layer": "~0.1.0",
     "walkdir": "0.0.7"

build/tasks/install-task.coffee

@@ -6,6 +6,14 @@ module.exports = (grunt) ->
   grunt.registerTask 'install', 'Install the built application', ->
     installDir = grunt.config.get('atom.installDir')
     shellAppDir = grunt.config.get('atom.shellAppDir')
-    rm installDir
-    mkdir path.dirname(installDir)
-    cp shellAppDir, installDir
+    if process.platform is 'win32'
+      runas = require 'runas'
+      copyFolder = path.resolve 'script', 'copy-folder.cmd'
+      # cmd /c ""script" "source" "destination""
+      arg = "/c \"\"#{copyFolder}\" \"#{shellAppDir}\" \"#{installDir}\"\""
+      if runas('cmd', [arg], hide: true) isnt 0
+        throw new Error("Failed to copy #{shellAppDir} to #{installDir}")
+    else
+      rm installDir
+      mkdir path.dirname(installDir)
+      cp shellAppDir, installDir

script/copy-folder.cmd

@@ -0,0 +1,18 @@
+@echo off
+
+set USAGE="Usage: %0 source destination"
+
+if [%1] == [] (
+  echo %USAGE%
+  exit 1
+)
+if [%2] == [] (
+  echo %USAGE%
+  exit 2
+)
+
+:: rm -rf %2
+if exist %2 rmdir %2 /s /q
+
+:: cp -rf %1 %2
+xcopy %1 %2 /e /h /c /i /y /r