I receive this error message: "Unknown file type (binary data)" when trying to deploy my SQL CE database. What did I do wrong?

This line should be added inside the tag <system.web> </system.web>. Username and password can be your login credentials for the system.

Therefore, the following is the whole web.config-content with which everything works:

Please note that our Control Panel does not really accept the .cshtml-files (webpages) and the .sdf-file (database) and you will always see the error message: "Unknown file type (binary data)". However, please just ignore the error message and by following the above guideline, everything will work as expected.