not sure if you can as a user, a Cakewalk programmer probably could I'm guessing.
you could just create a new project, name it 1, then repeat this a number of times (name it 2, 3, 4 ..) and the corrupt file would move down in the order list....and eventually dissapear iic. (my list has 8 files).
not sure if this list is based on a number of projects, or a time period....but I expect it will disappear by itself sometime.