Why do I get file not found excpetion with Interaction.Shell method?

Question

I want to open a notepad file using VisualBasic.Interaction.Shell method. At present I get a file not found exception using the following code.

int pid = Interaction.Shell(@"D:\abc.txt", AppWinStyle.NormalNoFocus, false, -1);

But this works:

int pid = Interaction.Shell(@"notepad.exe", AppWinStyle.NormalNoFocus, false, -1);

Which just opens a notepad file. Why is this?

I do need it to open a file in a specific location. I see some advantage with Interaction.Shell execution. How is it possible to open a file in a specific location using Interaction.Shell?