In the open document list (hover), put newly open docs at top of list instead of the bottom

For instance, if I open several Excel spreadsheets, the newest spreadsheet is listed at the bottom of the list.  My personal preference would be to have the oldest open items at the bottom of the list, and the newest ones at the top.  As it is now, whenever I open a new document, I have to manually move it to the top of the list.