I've done research earlier this year and as far as I know these systems
are compatible with UNIX paths: Cygwin, Epoc, OS X, OS2, Unix, Win32,
Amiga.
I only have Win32 and Fedora systems available, so i tested with
Cygwin, AS and Fedora. (And cygwin actually has another problem with
access rights.) VMS is hella weird, so it probably won't work, but
looking at the test matrix that's not a change. Mac OS classic won't
work either, since they use ':', but again, this didn't work before
either; plus, i highly doubt anyone would ever try to install this on
such an old mac.
I can make the path tests entirely platform independent if you'd like
me to, but that would make the tests more complicated with little
benefit in my opinion. Your call.
I'll assume you were only interested in test output on non-unix/win32
system and will skip pasting the outputs i have unless you want me to.