Interacting with outlook from an ASP.NET core blazor web-site

I am converting an old Silverlight application into Asp.Net Core, using Blazor and Razor Pages.

The old application is opening Outlook, and creating an email ready to send with a Subject, From etc, plus a series of attachments.  It is creating an object to do this using the following code:

Dynamic outlook = AutomationFactory.GetObject("Outlook.Application").

The old COM based approach is not supported in ASP.Net core web-sites, however I haven’t been able to find any alternatives.  Any suggestions as to how I can do this in an ASP.Net Core Blazor web-site would be greatly appreciated.  Note that I cannot use a simple MailTo: (as I need to add attachments), and don’t actually want to send the email – I just want it created and loaded in Outlook, ready for the user to manually review\edit and send.