To many cards

What is the file name and where it located when you get too many cards open when you have one card open. The reason I ask is my touch pad is after many years giving me this message with only one card open. I restart the pad and it begins to run fine again for a while. Back many years ago there was a posting about a file in touchpad that would grow very large and cause this problem. By deleting this file the problem was corrected. I cannot find reference to this file by searching. There may even been a patch to stop this file from growing or maybe this is wishful thinking. Any old timers recall what I am reffering to?