Windows Search web search provider

Dear Microsoft Support Team,

I am currently working on integrating a custom enterprise search experience into Windows. While reviewing the documentation on the Windows Search Provider App Extension, I found that the manifest requires:

<uap3:AppExtension

Name="com.microsoft.windows.websearchprovider"

...

/>

I would like clarification on two points:

Taskbar / Start Menu Integration

Is it possible to specify a different Name value (e.g., a custom identifier) instead of com.microsoft.windows.websearchprovider, in order to register my own search provider that integrates directly with the Windows Taskbar or Start Menu search box?

  Or is this extension name reserved exclusively for Microsoft’s built-in web search provider (Bing), making it impossible for third-party developers to fully integrate at the taskbar level?
  
  **Cookie and Session Handling**
  
     When Windows Taskbar / Start Menu search invokes a registered search provider, is there a supported way to handle cookies or authentication sessions (e.g., passing and persisting authentication cookies between requests)?
     
        If so, what mechanism should developers use to manage these cookies?
        

My goal is to understand whether a third-party search backend can officially integrate with the taskbar / Start Menu search surface, or whether the extension point is restricted to system components only.

Any clarification or official guidance you can provide on these integration possibilities would be greatly appreciated.

Best regards,

Damoon