win_add2path.py does not add user site directory

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2016-08-05.21:31:26.129>
labels = ['type-bug', 'OS-windows']
title = 'win_add2path.py does not add user site directory'
updated_at = <Date 2016-08-06.07:35:18.905>
user = 'https://github.com/altendky'

bugs.python.org fields:

activity = <Date 2016-08-06.07:35:18.905>
actor = 'SilentGhost'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Demos and Tools', 'Windows']
creation = <Date 2016-08-05.21:31:26.129>
creator = 'altendky'
dependencies = []
files = ['44028']
hgrepos = []
issue_num = 27696
keywords = ['patch']
message_count = 1.0
messages = ['272060']
nosy_count = 5.0
nosy_names = ['paul.moore', 'tim.golden', 'zach.ware', 'steve.dower', 'altendky']
pr_nums = []
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue27696'
versions = ['Python 3.5']