Which "move" do you mean? ReplaceFileA's return code exposes various levels of non-atomicity (https://docs.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-replacefilea) and Transactional NTFS (e.g. MoveFileTransactedA) has already been deprecated (https://docs.microsoft.com/en-us/windows/win32/fileio/deprecation-of-txf). Perhaps there are other, even more arcane variations on this conceptually simple operation on Windows, but I don't know... Supporting this madness in a cross-platform way is even more interesting.