Thats the date of the patch release. I.e. (0419) is the 19th April 2013 patch which is 1.57.44.
Just update your client to 1.57.43 (0416) then run using the DBO.exe found in the DBO_CT_TW folder.
Last edited on April 19th, 2013 at 06:30 PM.
Reason: Double Post