As of PDL-2.4.9, mapfraw and mapflex are not available for win32 platforms
(except for cygwin) because MS does not have POSIX mmap/munmap support.
Given that we currently make fairly simple use of mmap/munmap, it should be
possible to write wrapper functions for win32 to provide the needed functions.
See the example code and link by David Mertens in PDL/Basic/Core/Core.xs.PL
between the =begin windows_mmap and =end windows_mmap markers for
details and a rough idea-type implementation.