The request filtering module is configured to reject the path in the URL that contains the Hiddensegment section.
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Open C:\Windows\System32\inetsrv\config Path
Locate the ApplicationHost.config file and right-click First to get administrator privileges.
Find the hiddensegments node and delete the directory that contains it in your website. Directories that are set under this node will be denied access.
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The page you requested could not be supplied due to an extended configuration issue. If the page is a script, add a handler. If you should download the file, add a MIME map
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Workaround:
Open iis-Web Site-"Features View-" MIME type,
Double-click inside to configure the appropriate values:
The page you requested could not be supplied due to an extended configuration issue. If the page is a script, add a handler. If you should download the file, add a MIME map