[issue19955] When adding .PY and .PYW to PATHEXT, it replaced string instead of appending

[nickhil rokkam]

New submission from nickhil rokkam:

Following installer overwrote the PATHEXT string after selecting the "add to path" installation option.
http://www.python.org/ftp/python/3.3.3/python-3.3.3.amd64.msi

----------
components: Installation
files: python-3.3.3.amd64.msi
messages: 205941
nosy: nickhil.rokkam
priority: normal
severity: normal
status: open
title: When adding .PY and .PYW to PATHEXT, it replaced string instead of appending
type: behavior
versions: Python 3.3
Added file: http://bugs.python.org/file33097/python-3.3.3.amd64.msi

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<http://bugs.python.org/issue19955>
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