Jet Reports tab is not loaded when opening Excel from External C# WFA app

Hello,

When I normally open Excel from PC, Jet tab is loaded, but If I open Excel from C# app with Microsoft.Office.Interop.Excel it loads up Excel without Jet tab. What can I do to get that tab?

I've been also trying with this:

xlApp.Application.RegisterXLL(@"C:\Program Files (x86)\JetReports\jetreports.xlam");

didn't work.

I know there's an option to open Excel from C# with Process.Start("filepath"), but then i can't minimize or hide Excel file.

let me know. 

thank you