On Mon, 22 Oct 2007 23:00:59 -0400, Ron Rosenfeld
wrote:

The problem is that without some rule (3 or 4 characters) or an all-inclusive
list, you really can't tell whether the characters after the last dot are a
file type extension, or part of the file name.

For clarity, I should have added to that sentence:

"...or part of the file name, if you make the file type extension optional"
--ron