The chkdsk command is running with a specified code-page because it's
running within DOS or Windows. I strongly suspect that you'll find that
if you change the code-page, all kinds of nasty things will happen.
Again, if you can provide an actual specification that indicates that
these characters are allowed across *all* code-pages, then the patch
you've suggested may be useful, but until such time I doubt that it will
be adopted.
The chkdsk command is running with a specified code-page because it's
running within DOS or Windows. I strongly suspect that you'll find that
if you change the code-page, all kinds of nasty things will happen.
Again, if you can provide an actual specification that indicates that
these characters are allowed across *all* code-pages, then the patch
you've suggested may be useful, but until such time I doubt that it will
be adopted.