IIS Express Configuration File
Where is the IIS Express configuration / metabase file found?
Location of the IIS Express configuration file.
My Documents > IIS Express > config
Usually in one of these paths:
%userprofile%\documents\iisexpress\config\applicationhost.config %userprofile%\my documents\iisexpress\config\applicationhost.config
Update for VS2015 (and newer):
$(solutionDir)\.vs\config\applicationhost.config
Note: The ".vs" folder may be hidden. Type it directly in the path in Windows Explorer.