Yes, and I see the same behavior after defining my own column set. No descending sort by Extension. So - YABBearded Kirklander wrote: It appears that the Extention column is "stuck" and only sorts from A down to Z even if you click on it to toggle between A to Z and Z to A.
Also, (this should probably come to Feature Requests) - let Extension to be among standard columns, such as Name, Size, Type etc.
Oh... another thing: when Extension column is shown, it would be nice that Name colunm will not show file extension, only name.