In Excel, the list of most recently used files is never updated. I can save a
file in Excel, close the application, then upon reopening the Excel
application, the program will display the same list which has remained
unchanged in 6 months. regardless of which Excel files I open and close, the
most recent list never becomes updated. In the options menu, I can change
the number of most recent files to any number, but upon open in excel in
reverts back to 9 files. I experimented with Word, and the most recent files
option works just fine, therefore my problem only exists in Excel.

Any ideas?