I know that if you click the Name header that the sort is reversed (click it
again and it reverses again).

I don't have a guess why your names aren't sorted correctly.

wrote:

It also doesn't seem to have anything to do with file size or date
created/modified. I created a bunch of Excel files today, all the same
size and they would not sort correctly after clicking on "Name".
However, when the dialog box initially opens, they are sorted
correctly. It is only when you click on the "Name" header that they
get messed up.

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Dave Peterson