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How to deploy folder to a SharePoint 2010 Web Application Root folder (inside inetpub\wwwroot\wss\VirtualDirectories\80) in the solution package(wsp)?
Which kind of item I should use in the visual studio project? because nothing is mapped to {WebApplicationRoot} directly!!
As the comments mention, you generally do not deploy files randomly in SharePoint as there is a specific structure that SharePoint expects at the root of a site. If you must do something like this, you might want to move it to a subdomain outside of SharePoint like chat.domain.com where domain.com points to sharePoint and chat.domain.com points to a regular IIS website that hosts the chat application. You could then add links/iframes in SharePoint to call the chat application.
From the Visual Studio side, you would treat it as a normal web application project.
I finally managed to deploy the files to _layout folder and copy it in the FeatureActivated.
HttpRuntime.AppDomainAppPath