Fiddler and Windows 8 Metro-style applications

Eric Law posted details on how to get Fiddler to work with new Windows 8 Metro style applications:

Over on StackOverflow, a new Windows 8 user asked how to get Fiddler working with new Windows 8 Metro-style applications. These applications work somewhat differently than classic desktop applications, and require a bit of special configuration work to get Fiddler to work properly.

Fear not, however, Windows 8 and Fiddler get along just fine after a few tweaks. Many of my colleagues have been using Fiddler to debug Metro-style applications over the last few months.

There are three important Windows 8 changes that impact Fiddler:

  1. The .NET CLR 2.0 isn't installed by default
  2. Metro-style applications require a specific Capability to communicate with the localhost (where Fiddler runs)
  3. Metro-style applications do not respect the per-User Trusted Root Certificates store

Each of these three issues can be worked around to restore the full functionality of Fiddler when running on Windows 8...

Details follow, including pictures and exactly what to (pardon the pun) fiddle with.

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