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Surprisingly, this returns FALSE / nbytes = 0 / GetLastError = ERROR_INVALID_HANDLE on WinXP if the number of bytes exceeds some maximum and the handle refers to a pipe. Since you don't know what kind of handle you're writing to in write_overlapped, it seems reasonable to do the write in chunks.
Sorry, I made a mistake. The value returned by GetLastError() is 1450 / ERROR_NO_SYSTEM_RESOURCES.
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