The Message Analyzer WebProxy provider depends on the FiddlerCore library. The FiddlerCore library belongs to Telerik, Inc. and must be installed separately. Please visit http://www.telerik.com/fiddler/fiddlercore to download the FiddlerCore installer and library from Telerik. A restart of Message Analyzer is not necessary.
Below is a screen capture.
To solve the issue, we simply download and install the FiddlerCore library, at present, from this URL. The remaining issue is to determine where to install the FiddlerCore library. By default, FiddlerCore installer installs the library under the directory where the installer is. The directory would be a wrong directory for Microsoft Message Analayzer. To work with FiddlerCore, Microsoft Message Analyzer requires the FiddlerCore library to be installed under the directory of Microsoft Message Analyzer. If you install Microsoft Message Analyzer using its default installation directory, the FiddlerCore library's installation directory should be,
If you are running 32-bit Windows or you installed 32-bit Microsoft Message Analyzer on its default installation directory, the directory to install the FiddlerCore library should be,
C:\Program Files\Microsoft Message Analyzer\FiddlerCoreAPI
C:\Program Files (x86)\Microsoft Message Analyzer\FiddlerCoreAPI
Below is a captured FiddlerCore library installer screen shot that shows the correct installation directory is entered,
To configure and run a Pre-Encryption for HTTPS trace, see Microsoft Technet article Using the Network Tracing Features.