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I could reproduce the write problem on XPSP2; I get the
Win32 error ERROR_NO_SYSTEM_RESOURCES after fwrite returns
(from GetLastError).

I can't reproduce the fread problem, though: in Python,
f.read(90*2**20) just returns with a 90MiB string. So it
could be a limitation of your machine (e.g. it might not
have enough memory), or of the server machine. I'm hesitant
to add a work-around for that into Python if this isn't a
system limitation. Performing multiple reads is also bad:
what happens if the first read succeeds, and the second one
fails? It might be that the system *really* is out of resources.