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If you are running a .NET 3.5 version of Sitefinity bellow is what you have to do to remove the extension.
1) Edit the web.config file, in <cms> configuration section set the pageExtension property to empty string:
in system.webServer/modules configuration section make the bellow edit:
2) Open your IIS manager and go to your website configuration screen. Go to HttpHandlers mapping and add a wildcard script map to the aspnet_isapi.dll.
If you are running ASP.NET 4.0 and .NET 4.0 version of Sitefinity 3.7 SP4 you do not need to add a wildcard script map as .NET 4.0 has a built in extensionsless urls handler.
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