launcher.msi has different product codes between 32 and 64-bit

[zooba]

BPO	28110
Nosy	@pfmoore, @tjguk, @zware, @zooba
PRs	[Do Not Merge] Convert Misc/NEWS so that it is managed by towncrier #552

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/zooba'
closed_at = <Date 2016-09-17.23:35:46.846>
created_at = <Date 2016-09-12.20:37:34.431>
labels = ['type-bug', '3.7', 'OS-windows']
title = 'launcher.msi has different product codes between 32 and 64-bit'
updated_at = <Date 2017-03-31.16:36:38.789>
user = 'https://github.com/zooba'

bugs.python.org fields:

activity = <Date 2017-03-31.16:36:38.789>
actor = 'dstufft'
assignee = 'steve.dower'
closed = True
closed_date = <Date 2016-09-17.23:35:46.846>
closer = 'steve.dower'
components = ['Windows']
creation = <Date 2016-09-12.20:37:34.431>
creator = 'steve.dower'
dependencies = []
files = []
hgrepos = []
issue_num = 28110
keywords = []
message_count = 3.0
messages = ['276113', '276856', '276858']
nosy_count = 5.0
nosy_names = ['paul.moore', 'tim.golden', 'python-dev', 'zach.ware', 'steve.dower']
pr_nums = ['552']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue28110'
versions = ['Python 3.5', 'Python 3.6', 'Python 3.7']

[zooba]

The launcher.msi file that is part of 3.6.0b1 is different between the 32-bit and 64-bit release - specifically, a different product code.

This means that when you install one followed by the other, it will insist on updating the launcher even though the are the same. This may cause unnecessary UAC prompts.

Other than this, there aren't any ill effects. But they're supposed to be using the same product code, so I need to investigate why they are different.

[python-dev]

New changeset 13001cf82931 by Steve Dower in branch '3.5':
Issue bpo-28110: launcher.msi has different product codes between 32-bit and 64-bit
https://hg.python.org/cpython/rev/13001cf82931

New changeset f0fbb09e2d90 by Steve Dower in branch '3.6':
Issue bpo-28110: launcher.msi has different product codes between 32-bit and 64-bit
https://hg.python.org/cpython/rev/f0fbb09e2d90

New changeset 64d6e96819a0 by Steve Dower in branch 'default':
Issue bpo-28110: launcher.msi has different product codes between 32-bit and 64-bit
https://hg.python.org/cpython/rev/64d6e96819a0

[python-dev]

New changeset dd7e3c81c4f0 by Steve Dower in branch '3.6':
Fixes bad merge for issue bpo-28110
https://hg.python.org/cpython/rev/dd7e3c81c4f0

New changeset f4cdc125ed52 by Steve Dower in branch 'default':
Fixes bad merge for issue bpo-28110
https://hg.python.org/cpython/rev/f4cdc125ed52