Configure Fiddler to use a 3rd party Diff tool

I use the awesome Fiddler2 to debug HTTP, and I needed to compare sessions. Fiddler has a support for this, but when I clicked Tools - Compare Sessions, it prompted me to install Windiff.exe.

I haven't found a way to set the preferred Diff tool in the UI (via Options), so after looking at the click handler for the menu in Reflector, I found out that the value can be set via Registry key:

  1. Open Registry, go to:
HKEY_CURRENT_USER\Software\Microsoft\Fiddler2
  1. Add a new String Value called CompareTool and set the value to the path of your favorite Diff tool
(e.g. "C:\Program Files\Beyond Compare 3\BCompare.exe")
  1. Restart Fiddler

That's it!

posted @ Thursday, September 17, 2009 12:41 PM

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# re: Configure Fiddler to use a 3rd party Diff tool

Left by avi at 4/22/2010 9:58 PM
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nice one

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