Dont use UT but checking their Forum the Traffic.bgl is the file created by UT.
With FS9 you can have multiple traffic .bgl files. I use Traffic_Military.bgl for my military AI. It's not a good idea to mess with the Traffic.bgl, that's the one created and used by UT.
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Traffic030528.bgl is the FS9 default file name, so Im guessing this is the one you want to disable for now.
You dont have to delete a file, just change the .bgl extension to something else, like traffic030528.xxx
Cheers,
Dave
At that time [1909] the chief engineer was almost always the chief test pilot as well. That had the fortunate result of eliminating poor engineering early in aviation.