Sun, 30 Dec 2018 16:25:15 +0100 wenzelm reject further illegal chars according to https://docs.microsoft.com/en-us/windows/desktop/fileio/naming-a-file
Sun, 30 Dec 2018 16:06:09 +0100 wenzelm tuned;
Sun, 30 Dec 2018 15:36:43 +0100 wenzelm more strict check: avoid confusion of Path.basic with Path.current / Path.parent;
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