Starting Default Browser with a Local File from a C# WFA app

Question

I've been trying to make an application I'm working on launch my default browser and load a local help file.  The code I'm using is:

 

string target = @"timers.htm";

try

{

   System.Diagnostics.Process.Start(target);

}

catch

(

   System.ComponentModel.Win32Exception noBrowser)

{

   if (noBrowser.ErrorCode == -2147467259)

   MessageBox.Show(noBrowser.Message);

}

   catch (System.Exception other)

{

   MessageBox.Show(other.Message);

}

 

This works fine if I use IE or Edge as my default browser, but I really want to use Chrome. But with Chrome set as the default browser, it launches but gives me a "file not found" error.  

 

I suspect I'm missing something simple here but can't seem to track it down.  Can anyone help me with this?

 

Thanks, Jerry