My automated file and folder cleanup program just reported that it has deleted all the ".BAK" files in the "C:\Program Files\TDS\xdynamic\tds.fps" folder. There were a total of 17 such files: "dcsfps1.bak" all the way to "dcsfps17.bak". Questions: 1. What is the purpose of these BAK files? 2. Is it OK if they are deleted ? Thanks.