exec.py in sublime text 2

exec.py

        # Set temporary PATH to locate executable in arg_list
        if path:
            old_path = os.environ["PATH"]
            # The user decides in the build system whether he wants to append $PATH
            # or tuck it at the front: "$PATH;C:\\new\\path", "C:\\new\\path;$PATH"
            os.environ["PATH"] = ";".join( map(lambda p:p.encode(sys.getfilesystemencoding()), os.path.expandvars(path)))

Might be totally wrong though