First pass at getting git and tar.gz working on Windows.

tools/create_sdk.py

 #!/usr/bin/env python
 #
 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 #
 # A script which will be invoked from gyp to create an SDK.
 #
 # Usage: create_sdk.py sdk_directory
 #
@@ skipping 281 matching lines @@
         dest_dir = join (ANALYZER_DEST, os.path.dirname(jarToCopy))
         os.makedirs(dest_dir)
         dest_file = join (ANALYZER_DEST, jarToCopy)
         src_file = join(ANALYZER_HOME, 'util', 'analyzer', jarToCopy)
         copyfile(src_file, dest_file)
 
   # Create and populate util/pub.
   copytree(join(HOME, 'utils', 'pub'), join(UTIL, 'pub'),
            ignore=ignore_patterns('.svn', 'sdk'))
 
+  # Copy in 7zip for Windows.
+  if utils.GuessOS() == 'win32':
+    copytree(join(HOME, 'third_party', '7zip'),
+             join(join(UTIL, 'pub'), '7zip'))
+
+    ReplaceInFiles([
+        join(UTIL, 'pub', 'io.dart'),
+      ], [
+        ("var pathTo7zip = '../../third_party/7zip/7za.exe';",
+         "var pathTo7zip = '7zip/7za.exe';"),
+      ])
+
   revision = utils.GetSVNRevision()
 
   # Copy dart2js.
   CopyDart2Js(build_dir, SDK_tmp, revision)
 
   # Write the 'revision' file
   if revision is not None:
     with open(os.path.join(SDK_tmp, 'revision'), 'w') as f:
       f.write(revision + '\n')
       f.close()
 
   move(SDK_tmp, SDK)
   utils.Touch(os.path.join(SDK, 'create.stamp'))
 
 if __name__ == '__main__':
   sys.exit(Main(sys.argv))