For those who use the windows version of UAL electronic timetable - it seems like every update of the schedule adds a new E11924.exe and E11924.htm (numbers purely for illustrative purposes only) file to the UAL E-timetable folder. When is it safe to delete these files? It seems highly in-efficient to leave these crumbs on your hard drive, especially when the .exe file is over 2.5 MB's.

Note: It seems after the 8/5/02 update, the E180304.exe and subsequent files have shrunk from 4.5 MB to around 2.8 MB's. Does this suggest a tremendous reduction in the number of flights, thus a smaller update file?