Provide a better error message when the file path is too long on Windows

GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2016-08-10.22:59:55.783>
labels = ['type-bug', 'OS-windows']
title = 'Provide a better error message when the file path is too long on Windows'
updated_at = <Date 2020-06-13.00:13:26.237>
user = 'https://github.com/brettcannon'

bugs.python.org fields:

activity = <Date 2020-06-13.00:13:26.237>
actor = 'eryksun'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Windows']
creation = <Date 2016-08-10.22:59:55.783>
creator = 'brett.cannon'
dependencies = []
files = []
hgrepos = []
issue_num = 27729
keywords = ['patch']
message_count = 4.0
messages = ['272382', '272383', '272427', '371429']
nosy_count = 7.0
nosy_names = ['brett.cannon', 'paul.moore', 'tim.golden', 'zach.ware', 'eryksun', 'steve.dower', 'ZackerySpytz']
pr_nums = ['20844']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue27729'
versions = []