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The previous logic was not allowing put-object on windows when the parent directory did not already exist, and would not always return the correct error if an ancestor in the path already existed as a file. The problem is the different behavior of the os.Stat command in Windows compared to *nix in backend/posix/posix.go in function PutObjectWithPostFunc. The os.Stat returns ENOTDIR on *nix if the parent object is a file instead of a directory. On Windows, if the parent object does not exist at all, the return code of such os.Stat is ERROR_PATH_NOT_FOUND which is mapped to ENOTDIR. However this is inappropriate in this case. As a result, the return code of the os.Stat is incorrectly interpreted as if the parent object is a file instead of the parent object does not exist. Which then leads to a failed upload. This fix validates the existing parent structure on put to make sure the correct error is returned or the put is successful. Fixes #1702