It is always confusing for the users that the Excel files they work on after opening from Server Explorer are named like 'TM11B.xls' instead of 'Actuals 2010.xls' they doubleclicked on.
I understand the need of uniqueness of names, but changing it to something like '(TM11B) Actuals 2010.xls' would be enough.
I usually use macro for displaying a name that tells the user which file it is, but in such a case I cannot use such a report in TM1Web.