diff --git a/appveyor.yml b/appveyor.yml
new file mode 100644
index 000000000..59ae3d9ee
--- /dev/null
+++ b/appveyor.yml
@@ -0,0 +1,29 @@
+# appveyor file
+# http://www.appveyor.com/docs/appveyor-yml
+project_id: "fgmr18mx183acim0"
+
+version: "{build}"
+
+init:
+  - git config --global core.autocrlf input
+
+environment:
+  matrix:
+    - nodejs_version: 0.10
+
+platform:
+  - x86
+
+install:
+  - ps: Update-NodeJsInstallation (Get-NodeJsLatestBuild $env:nodejs_version)
+  - cmd: SET PATH=C:\Program Files (x86)\MSBuild\12.0\bin\;%PATH%
+  - cmd: SET PATH=C:\python27;%PATH%
+  - cmd: python script/bootstrap.py
+  - python script/build.py
+
+test_script:
+  - node --version
+  - npm --version
+  - cmd: python script/test.py
+
+build: off
diff --git a/script/lib/util.py b/script/lib/util.py
index c78ca213e..17595742e 100644
--- a/script/lib/util.py
+++ b/script/lib/util.py
@@ -31,7 +31,7 @@ def scoped_cwd(path):
 
 def download(text, url, path):
   safe_mkdir(os.path.dirname(path))
-  with open(path, 'w') as local_file:
+  with open(path, 'wb') as local_file:
     web_file = urllib2.urlopen(url)
     file_size = int(web_file.info().getheaders("Content-Length")[0])
     downloaded_size = 0