...

APC Viewer/Program.cs

@@ -22,6 +22,7 @@ public class Program
             Args = args,
             ContentRootPath = Path.GetDirectoryName(assembly.Location)
         });
+        _ = webApplicationBuilder.Host.UseWindowsService();
         AppSettings appSettings = Models.Stateless.AppSettings.Get(webApplicationBuilder.Configuration);
         if (string.IsNullOrEmpty(appSettings.WorkingDirectoryName))
             throw new Exception("Working directory name must have a value!");