Since the files have effectively been abandoned, I think removing them should be considered now.  The three files in /Misc, for wing-3, 4, and 5, are
python-wing3.wpr
python-wing4.wpr
python-wing5.wpr

The current version of Wing is 8.1.1.  The files were last edited in March 2011, a decade ago, by M. Foord.  The last contains

#!wing
#!version=5.0
##################################################################
# Wing IDE project file                                          #
##################################################################
[project attributes]
proj.directory-list = [{'dirloc': loc('..'),
                        'excludes': [u'.hg',
                                     u'Lib/unittest/__pycache__',
                                     u'Lib/unittest/test/__pycache__',
                                     u'Lib/__pycache__',
                                     u'build',
                                     u'Doc/build'],
                        'filter': '*',
                        'include_hidden': False,
                        'recursive': True,
                        'watch_for_changes': True}]
proj.file-type = 'shared'

*4.* is the same except for the version comment.  Both are specialized for working with Lib/unittest, failing to exclude most of the other __pycache__ directories.  I wonder whether current Wing now knows that it should ignore __cache__ directories.  (I considered emailing support@wingware.com, but decided to wait.)  In the absence of more comments, we could inquire on python-dev.

In 2019, these .ini-format configuration data files were marked as executable scripts.  I believe that this was a mistake.