are the TeXLive engine MSys application ?
There is no explicit support for msys in TeX Live, as far as I can
recall. There is support for cygwin and native Windows.
How do you handle texi2xxx
tools for MSW in TeXLive ?
I'm not sure what you're asking, but as you know, texi2dvi is a shell
script. There is no special attempt to make a "Windows equivalent" of
it that is not a shell script. Thus it cannot be used by people on
native Windows without any Unix tools installed. This has never been a
problem.
Vincent, my question to you: is there any chance of you moving away from
MSYS? Supporting such an old, non-free, Windows-based system
nontrivially complicates the code, affecting everyone. As we have seen,
here and before, at great length.
k