Delete old .BKF files in the BEData folder

I have a Backup Exec 2012 installation, and in the BEData folder i noticed that there are many .bkf files from 2013. 603 gigs to be exact and want to know if there is a process to delete these files from the folder with out a negative consaquence. Can you simply right click and delete? Will this update any catalogs that reference the files i delete? Is there a tool that i can use to delete them? 

Thanks 

V