One quirk with OSX is that the GUI is consistent with earlier Macs that permitted / in filenames (when : was used as the folder separator), but as / is now restricted to be the folder separator the two characters are swapped over behind the scenes.
This causes very odd bugs with GUI tools that launch CLI utilities. For example, Hugin uses make to process photos, and make doesn't support : in filepaths. However many users put photos in folders with a date in the name, and the dates.
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