Richard Oudkerk added the comment:
Sorry, I was not very clear.
If you use the O_TEMPORARY flag with open() to get a file handle, then the
share mode used with the underlying CreateFile() function is
X = FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE
whereas, if you don't use O_TEMPORARY then the share mode is
Y = FILE_SHARE_READ | FILE_SHARE_WRITE
While a handle is open with share mode X, you can only reopen the file if you
also use share mode X. Therefore (using the msvcrt) you can only reopen it
using O_TEMPORARY.*
* sopen() does give some extra control over the share mode, but you still can't
use it to get share mode X without also using O_TEMPORARY.
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<http://bugs.python.org/issue14243>
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