You can't remove them from the task pane directly, but removing them from
the File menu will also remove them from the task pane. If you want to
remove *all* of them, go to Tools | Options | General and clear the check
box for "Recently used file list." OK out. If you then want to reenable the
list, go back to the dialog and check it again.
To remove a specific file, press Ctrl+Alt+Hyphen. The mouse pointer will
change to a giant minus sign and *any menu item* you click on will be
deleted, so be careful! Click on the file you want to remove. One use "uses
up" this feature (ESC will dismiss it as well); if you want to remove
another file, press the shortcut again.
