this problem has started bothering me recently: I cannot get XP to show file extensions. Every time I click Tools -> Folder Options -> View -> Uncheck "Hide file extensions for known filetypes", nothing happens and when I view the Folder Options again, that checkbox is ticked again! Neither is the checkbox for "Hide protected system files" (just below) remembered. I don't have separate view settings for every folder and other checkboxes are remembered when I press Apply.
Please, could someone help me out on this?