Open with file explorer from anchor tag

I actually came up with a decent method of opening the Windows File Explorer having the synchronized DropBox files on the client from a website.  In this case, the website is running Blazor Server in .NET 7.  I create a SignalR Hub to which a small Windows Form application subscribes. 

using Microsoft.AspNetCore.SignalR.Client;
//replace localhost:7083 with your production URL
hubConnection1 = await ConnectToHub("https://localhost:7083/messageHub");

The website (using the DBX API) passes via SignalR the folder path and a userID to the Windows Form app. 

   var hubConnection = new HubConnectionBuilder()
       .WithUrl(url)
       .WithAutomaticReconnect()
       .Build();
   hubConnection.On<string, string>("ReceiveMessage", (message, userEmail) => 
// process received data from website....

The Windows Form app checks that the userID matches and then opens the path to the local DBX files:

 System.Diagnostics.Process.Start("explorer.exe", fullPath);

Because sometimes people install the DBX client in wacky places I also have a textbox in the Windows Form app that allows them to set the path to a Teams root folder (e.g., "C:\Users\userName\DropboxTeam\CompanyShare"

On the Blazor side:

@using Microsoft.AspNetCore.SignalR
// Link a method to a button click that calls:
 await HubContext.Clients.All.SendAsync("ReceiveMessage", dbxLocalPath, myUser.EmployeeEmail);
// in Program.cs don't forget:
using Microsoft.AspNetCore.SignalR;
builder.Services.AddSignalR();
app.MapHub<MessageHub>("/messageHub");
//Finally, make sure you have a Hub in your Blazor Server:
 public class MessageHub : Hub
 {
     public async Task SendMessage(string message)
     {
         await Clients.All.SendAsync("ReceiveMessage", message);
     }
 }

So the overall idea is that you have users with a little WinForm client receiving messages from BlazorServer to open file directories. Blazor sends a userID which you check matches the local WinForm client. Otherwise, all your users have File Explorer open when any one requests it from the website.