The location of the configuration folder depends on the settings for the multiuser mode.
In this folder the DVBViewer stores all settings and user specific data.
You can open an explorer window showing the folder contents from the DVBViewer with the menu item „About -> Configuration folder“.
You can get this explorer window also with "Start -> All Programs -> DVBViewer Program Group -> Configuration folder".
Or with the link "Show Configuration Folder" at the bottom of the Options.