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OK. I will work around it.
 
I was using 'mapping object of a specified size that is backed by the system paging file instead of by a file in the file system' - map->handle == INVALID_HANDLE_VALUE (-1), i.e. shared memory for inter-process communication (not my choice)
A use case was when all process were stopped and one wanted to start "fresh" using the same tag but with a bigger size. 
BTW, here's the result of the following script in Python 2.5
>>> import mmap
>>> map1 = mmap.mmap(fileno=-1, tagname='MyData', length=4096)
>>> map1[0] = 'a'
>>> map1[4095]='b'
>>> print len(map1), map1[0], map1[4095]
4096 a b
>>> map2 = mmap.mmap(fileno=-1, tagname='MyData', length=8192)
>>> print len(map2), map2[0], map2[4095]
8192 a b
which would indicate that it does 'resize' and preserves the data.
which means t