FileTarget should not momentarily release FileStream-handle on file-creation, as it might be locked-out by file-scanner that take exclusive lock (Thus preventing NLog from actually logging just after file-creation). See also #5379

But still trying to keep work-around for Windows FileSystem Tunneling (avoid newly-created-file re-using timestamp from from previous-file after file-archive/file-move). See also: #1100 and #1125