Scan destination for Epson Workforce Printer/Scanner

For the Epson Workforce 3640 all-in-one printer/scanner/fax, how does one set the destination folder (Windows 7) for scans originating from the scanner. (It's easy to set the destination for scans when the scan request is originated from the computer... but this question is how to set the scan destination folder when the scan request is originated from the printer/scanner itself.)

Question by Amazon Dies In Darkness on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.