PATHEXT is fundamental to Windows and Should be recognised by CYGWIN

[Nellis, Kenneth]

From: Erik Soderquist
> ... DOS did a lot of things
> against already established conventions, such as using a backslash
> instead of a forward slash as the directory separator, just "to be
> different".

Not just to be different, but to distinguish from slashes used as 
command qualifiers (a la VMS), don't you think?

--Ken Nellis