Overlapped read/write fix

[Eric Kohl]

Hi!

This patch fixes the MS Jet Database Engine. Overlapped reads and writes
must fail on Win9x.

Regards,

Eric

ChangeLog:
    * files/file.c:
    Overlapped read and write are only allowed on WinNT. On Win9x, they must
fail and set ERROR_INVALID_PARAMETER.
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