I realize this is probably to late to be be of use for your text-viewing task (which is presumably solved by now), but for future reference, you might want to look up a Windows port of the UNIX environment and tools provided by AT&T Research: http://www.research.att.com/sw/tools/uwin/.

The ATT "UNIX for Windows" package is called "UWIN" (how clever?), it's free/open-source, and I noticed that the description of features includes:

Memory mapping and shared memory:
Both mmap() and the system V shared memory facilities are provided.

In reply to Re^3: Displaying/buffering huge text files by graff
in thread Displaying/buffering huge text files by spurperl

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