Net-client with .Net framework 4.5
With the .Net Framework 4.5 the Internet Explorer will fail to launch an application that uses managed browser hosting controls such as the arcplan .Net client. The previous behavior can be restored by setting the EnableIEHosting value of the registry subkey HKLM/SOFTWARE/MICROSOFT/.NETFramework to 1.
Find more information about the changes in .Net Framework 4.5 under http://msdn.microsoft.com/en-us/library/hh367887.aspx
The attached batch files (one for 32-bit OS and one for 64-bit OS) can change the registry key to the necessary value. Please keep in mind that executing one of the reg-files may require Administrator privileges on the machine and that they may have to be "run as Administrator".