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Hmmm. I believe the Win10 Anniversary Update is supposed to include the new Ubuntu-bash-linux subsystem. I presume it should include sed. I need to see if I have the update and the subsystem, and what it includes. I could have done this one, within one file, with replace-all. But I expect to be doing some multifile name changes, and I presume sed will do that.
I decided to apply this tomorrow after re-checking the changes. I checked current configdialog issues and decided not to worry about backports. Planned and proposed cosmetic fixups -- PEP8 renamings, ttk replacements (see #27755, for instance), and revised layouts will be bigger issues. And I want to start on these next.