Hi,
When you say "open files sorted by date" do you mean from Windows Explorer/My Computer or from with the Open File Dialog window in an application ie Word or Excel?
Also what view are you using to see the list of files and folders, List, details or what,
If you switch the view to details and click on the grey bit at the top of the data column, the list will switch round still in date order but the folders will be at the top in the order they were created and your last file created at the bottom of the list.
If you then switch to ordinary list view the order you chose will still be active, if you want that altered in any of the other views, say thumbnails, icons etc, choose details first and then change that first.
HTH
John