The Microsoft Silverlight add-on is listed as not verified in Microsoft Internet Explorer
Warning
The retired, out-of-support Internet Explorer 11 desktop application has been permanently disabled through a Microsoft Edge update on certain versions of Windows 10. For more information, see Internet Explorer 11 desktop app retirement FAQ.
Original product version: Internet Explorer
Original KB number: 2406108
Symptoms
You install Microsoft Silverlight in Internet Explorer. Next, you open the Manage Add-ons feature in Internet Explorer and view the Silverlight add-on information. The publisher is listed as (Not verified) Microsoft Corporation.
Cause
This behavior occurs because while the installation package of Microsoft Silverlight is digitally signed, the add-on file npctrl.dll isn't digitally signed. Internet Explorer checks the digital signature of the control's binary file when it determines the publisher. If the signature is missing, the publisher information will be listed as Not verified.
Resolution
This is a behavior by design.
More information
The installation package of Microsoft Silverlight is digitally signed. This ensures the add-on is installed from an identified resource. For more information, see Manage add-ons in Internet Explorer 11.
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