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Why do I get file not found excpetion with Interaction.Shell method?
int pid = Interaction.Shell(@"D:abc.txt", AppWinStyle.NormalNoFocus, false, -1);

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

using (Process process = Process.Start(@"D:abc.txt"))
{
    int pid = process.Id;

    // Whether you want for it to exit, depends on your needs. Your
    // Interaction.Shell() call above suggests you don't.  But then
    // you need to be aware that "pid" might not be valid when you
    // you look at it, because the process may already be gone.
    // A problem that would also arise with Interaction.Shell.
    // process.WaitForExit();
}

int pid = Interaction.Shell(@"notepad.exe D:abc.txt", false, -1);