.folder ok, folder. not

Another SharePoint idiosyncrasy: Microsoft lists the illegal characters not to use when naming things like folders in a document library to be:

” * : < > ? / \ |

So it stands to reason that I can name a folder, for example, .folder or fo.lder, however when I try to use a name with the period at the end of the name, say, folder. , then I get the following error:

So be careful naming folders, especially if doing so using a Power Automate Flow which results in a couple of hours chasing down a whacky ‘bad gateway’ error that provides no indication of what the heck is going here – not that it happened to me, er, um, a friend told me about this .

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