ac> The general accepted file naming convention is xxxxxxxx.ddn,
 ac> where xxxxxxxx is any 8-digit hexadecimal number, dd is
 ac> either SU, MO, TU, WE, TH, FR, or SA (denoting the
 ac> day-of-the-week the mail bundle was created), and n a digit
 ac> between 0 and 9 inclusive.

 ET> I was aware of the naming conventions, however, I have
 ET> noticed that some mailers/tossers create packets named other
 ET> things (Saw one that was like "0000FF86.W01", or something
 ET> to that extent earlier this week). 

Yes, you will find non-standard file naming conventions used by a small
number of programs, unfortunately.

---