Since there is no public information about this software, the only thing I can recommend to is a fresh installation. Backup the data before using File > Save as or File > Export then save the content to another partition. Go to Start > Search > Uninstall a program and remove the software completely. Just to be sure, navigate to Program Files folder and locate the installation of San Francisco 2. Remove all the remains from the folder as well (main folder included!). Reboot the PC, then re-install the software and open the backed up data. "Filer" should be available again.