Popen with keyword cwd cause windows error 2
===

I have a piece of code that takes in a user-provided path to an executable or batch file. I split the path to get the filename and path (tail and head), and use the head as the current working directory for the new process. If the path does not contain directories, it works fine. However, I get the following error if it does:

    WindowsError: [Error 2] The system cannot find the file specified

Example code:

    def poop(self, path_to_program):
        head, tail = path.split(path_to_program)
        if(head.startswith('"')):
            head = head.strip('"')

        if(tail.endswith('"')):
            tail = tail.strip('"')                

        if(head<>''):
            p = Popen(tail, cwd=head, shell=False)
        else:
            p = Popen(tail)

If `path_to_program` is not split and passed directly to Popen, it works fine. 

Not sure what's wrong.
