Hello Bream - Dreamer
To access hidden folders in Windows Explorer, click on the Tools tab, click on Folder options, click on View. Under the heading "Hidden Folders and files" click on "Show Hidden Folders and files".
You will then be able to access the folder "Program Data". In the folder called "Program Data" you will find a folder titled "Epson". In the Epson folder is a folder called "Printer". In the printer folder is the file (In my case anyway) called "EPAUDF01.AUD. When I deleted the file (that had swollen to 40 megabytes), the system (or the Epson Printer program... I'm not sure which), generated a new file that was 2 kilobytes in size, after I had restarted my machine. I keep monitoring the file to see if it changes size, but so far it hasn't.
Hope that helps!