Get Filename for use in flat file connection manager based on part of the filename which is constant

Hi,

I receive source flat files every day in the format area_ddmmyy_hhmmss.txt example : product_102412_123000.txt

The area of interest remains constant and the date can be constructed but the time is not constant every day i.e. tomorrow's file can product_102512_083010.txt

My question is I need to pass the full filename dynamically to the flat file source or the connection mgr daily for the load into SQL Server.

What is the best approach to do this?

THanks,

Samir