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New data point: in some contexts on Windows (not sure of the exact cause but I was dealing with multiple drives), even this workaround isn't enough. I ended up having to do something like this (i.e. manually search the path) on win32:
 def full_executable_path(invoked, environ):
 if os.path.splitext(invoked)[1]:
 return invoked
 
 explicit_dir = os.path.dirname(invoked)
 if explicit_dir:
 path = [ explicit_dir ]
 else:
 path = environ.get('PATH').split(os.path.pathsep)
 extensions = environ.get(
 'PATHEXT',
 # Use *something* in case the environment variable is
 # empty. These come from my machine's defaults
 '.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.PSC1'
 ).split(os.path.pathsep)
 for dir in path:
 for ext in extensions:
 full_path = os.path.join(dir, invoked+ext)
 if os.path.exists( full_path ):
 return full_path
 return invoked # Not found; invoking it will likely fail
 class Popen(subprocess.Popen):
 def __init__(
 self, args, bufsize=0, executable=None,
 stdin=None, stdout=None, stderr=None,
 preexec_fn=None, close_fds=False, shell=False, 
 cwd=None, env=None, 
 *args_, **kw):
 if executable is None and not shell:
 executable = full_executable_path(args[0], env or os.environ)
 super(Popen,self).__init__(
 args, bufsize, executable, stdin, stdout, stderr, 
 preexec_fn, close_fds, shell, cwd, env, *args_, **kw)