diff --git a/index.js b/index.js
index 30958dd..4e00d4e 100644
--- a/index.js
+++ b/index.js
@@ -1,15 +1,9 @@
 var os = require('os')
 var path = require('path')
-var fs = require('fs')
-var child = require('child_process')
-
-var plist = require('plist')
-var mkdirp = require('mkdirp')
-var rimraf = require('rimraf')
-var ncp = require('ncp').ncp
 
 module.exports = function packager (opts, cb) {
   var electronPath
+  var platform
 
   try {
     electronPath = require.resolve('electron-prebuilt')
@@ -26,110 +20,10 @@ module.exports = function packager (opts, cb) {
   var electronPkg = require(path.join(electronPath, 'package.json'))
   console.error('Using electron-prebuilt version', electronPkg.version, 'from', electronPath)
 
-  var electronApp = path.join(electronPath, 'dist', 'Electron.app')
-  var tmpDir = path.join(os.tmpdir(), 'electron-packager-mac')
-
-  var newApp = path.join(tmpDir, opts.name + '.app')
-
-  // reset build folders + copy template app
-  rimraf(tmpDir, function rmrfd () {
-    // ignore errors
-    mkdirp(newApp, function mkdirpd () {
-      // ignore errors
-      // copy .app folder and use as template (this is exactly what Atom editor does)
-      ncp(electronApp, newApp, function copied (err) {
-        if (err) return cb(err)
-        buildMacApp()
-      })
-    })
-  })
-
-  function buildMacApp () {
-    var paths = {
-      info1: path.join(newApp, 'Contents', 'Info.plist'),
-      info2: path.join(newApp, 'Contents', 'Frameworks', 'Electron Helper.app', 'Contents', 'Info.plist'),
-      app: path.join(newApp, 'Contents', 'Resources', 'app')
-    }
-
-    // update plist files
-    var pl1 = plist.parse(fs.readFileSync(paths.info1).toString())
-    var pl2 = plist.parse(fs.readFileSync(paths.info2).toString())
-
-    var bundleId = opts['app-bundle-id'] || 'com.electron.' + opts.name.toLowerCase()
-    var bundleHelperId = opts['helper-bundle-id'] || 'com.electron.' + opts.name.toLowerCase() + '.helper'
-    var appVersion = opts['app-version']
-
-    pl1.CFBundleDisplayName = opts.name
-    pl1.CFBundleIdentifier = bundleId
-    pl1.CFBundleName = opts.name
-    pl2.CFBundleIdentifier = bundleHelperId
-    pl2.CFBundleName = opts.name
-
-    if (appVersion) {
-      pl1.CFBundleVersion = appVersion
-    }
-
-    if (opts.protocols) {
-      pl2.CFBundleURLTypes = pl1.CFBundleURLTypes = opts.protocols.map(function (protocol) {
-        return {
-          CFBundleURLName: protocol.name,
-          CFBundleURLSchemes: [].concat(protocol.schemes)
-        }
-      })
-    }
-
-    fs.writeFileSync(paths.info1, plist.build(pl1))
-    fs.writeFileSync(paths.info2, plist.build(pl2))
-
-    function filter (file) {
-      var ignore = opts.ignore || []
-      if (!Array.isArray(ignore)) ignore = [ignore]
-      for (var i = 0; i < ignore.length; i++) {
-        if (file.match(ignore[i])) {
-          return false
-        }
-      }
-      return true
-    }
-
-    // copy users app into .app
-    ncp(opts.dir, paths.app, {filter: filter}, function copied (err) {
-      if (err) return cb(err)
-
-      if (opts.prune) {
-        prune(function pruned (err) {
-          if (err) return cb(err)
-          moveApp()
-        })
-      } else {
-        moveApp()
-      }
-
-      function prune (cb) {
-        child.exec('npm prune --production', { cwd: paths.app }, cb)
-      }
-
-      function moveApp () {
-        // finally, move app into cwd
-        var finalPath = path.join(opts.out || process.cwd(), opts.name + '.app')
-
-        fs.rename(newApp, finalPath, function moved (err) {
-          if (err) return cb(err)
-          updateMacIcon()
-        })
-      }
-    })
+  switch (os.platform()) {
+    case 'darwin': platform = require('./mac'); break
+    default: cb(new Error('Unsupported platform'))
   }
 
-  function updateMacIcon () {
-    var finalPath = path.join(opts.out || process.cwd(), opts.name + '.app')
-
-    if (!opts.icon) {
-      return cb(null, finalPath)
-    }
-
-    ncp(opts.icon, path.join(finalPath, 'Contents', 'Resources', 'atom.icns'), function copied (err) {
-      cb(err, finalPath)
-    })
-  }
+  platform.createApp(opts, cb, electronPath)
 }
diff --git a/mac.js b/mac.js
new file mode 100644
index 0000000..338f05b
--- /dev/null
+++ b/mac.js
@@ -0,0 +1,120 @@
+var os = require('os')
+var path = require('path')
+var fs = require('fs')
+var child = require('child_process')
+
+var plist = require('plist')
+var mkdirp = require('mkdirp')
+var rimraf = require('rimraf')
+var ncp = require('ncp').ncp
+
+module.exports = {
+  createApp: function createApp (opts, cb, electronPath) {
+    var electronApp = path.join(electronPath, 'dist', 'Electron.app')
+    var tmpDir = path.join(os.tmpdir(), 'electron-packager-mac')
+
+    var newApp = path.join(tmpDir, opts.name + '.app')
+
+    // reset build folders + copy template app
+    rimraf(tmpDir, function rmrfd () {
+      // ignore errors
+      mkdirp(newApp, function mkdirpd () {
+        // ignore errors
+        // copy .app folder and use as template (this is exactly what Atom editor does)
+        ncp(electronApp, newApp, function copied (err) {
+          if (err) return cb(err)
+          buildMacApp(opts, cb, newApp)
+        })
+      })
+    })
+  }
+}
+
+function buildMacApp (opts, cb, newApp) {
+  var paths = {
+    info1: path.join(newApp, 'Contents', 'Info.plist'),
+    info2: path.join(newApp, 'Contents', 'Frameworks', 'Electron Helper.app', 'Contents', 'Info.plist'),
+    app: path.join(newApp, 'Contents', 'Resources', 'app')
+  }
+
+  // update plist files
+  var pl1 = plist.parse(fs.readFileSync(paths.info1).toString())
+  var pl2 = plist.parse(fs.readFileSync(paths.info2).toString())
+
+  var bundleId = opts['app-bundle-id'] || 'com.electron.' + opts.name.toLowerCase()
+  var bundleHelperId = opts['helper-bundle-id'] || 'com.electron.' + opts.name.toLowerCase() + '.helper'
+  var appVersion = opts['app-version']
+
+  pl1.CFBundleDisplayName = opts.name
+  pl1.CFBundleIdentifier = bundleId
+  pl1.CFBundleName = opts.name
+  pl2.CFBundleIdentifier = bundleHelperId
+  pl2.CFBundleName = opts.name
+
+  if (appVersion) {
+    pl1.CFBundleVersion = appVersion
+  }
+
+  if (opts.protocols) {
+    pl2.CFBundleURLTypes = pl1.CFBundleURLTypes = opts.protocols.map(function (protocol) {
+      return {
+        CFBundleURLName: protocol.name,
+        CFBundleURLSchemes: [].concat(protocol.schemes)
+      }
+    })
+  }
+
+  fs.writeFileSync(paths.info1, plist.build(pl1))
+  fs.writeFileSync(paths.info2, plist.build(pl2))
+
+  function filter (file) {
+    var ignore = opts.ignore || []
+    if (!Array.isArray(ignore)) ignore = [ignore]
+    for (var i = 0; i < ignore.length; i++) {
+      if (file.match(ignore[i])) {
+        return false
+      }
+    }
+    return true
+  }
+
+  // copy users app into .app
+  ncp(opts.dir, paths.app, {filter: filter}, function copied (err) {
+    if (err) return cb(err)
+
+    if (opts.prune) {
+      prune(function pruned (err) {
+        if (err) return cb(err)
+        moveApp()
+      })
+    } else {
+      moveApp()
+    }
+
+    function prune (cb) {
+      child.exec('npm prune --production', { cwd: paths.app }, cb)
+    }
+
+    function moveApp () {
+      // finally, move app into cwd
+      var finalPath = path.join(opts.out || process.cwd(), opts.name + '.app')
+
+      fs.rename(newApp, finalPath, function moved (err) {
+        if (err) return cb(err)
+        updateMacIcon()
+      })
+    }
+
+    function updateMacIcon () {
+      var finalPath = path.join(opts.out || process.cwd(), opts.name + '.app')
+
+      if (!opts.icon) {
+        return cb(null, finalPath)
+      }
+
+      ncp(opts.icon, path.join(finalPath, 'Contents', 'Resources', 'atom.icns'), function copied (err) {
+        cb(err, finalPath)
+      })
+    }
+  })
+}