Hi,
If I understand, you have your website, hosting in
the same PC as the user?
So, when the user clicks on the button, you want to open Excel?
If so, you can
Impersonate some part of your code with a specific user, like that you can take his rights for just the Excel portion of code :
https://support.microsoft.com/en-us/help/306158/how-to-implement-impersonation-in-an-asp-net-application
