p.StartInfo.FileName = "somefile.html"

p.StartInfo.ErrorDialog = True ' this opens the "Open With" dialog for unknown file types

    IntPtr psiStartInfo,

   ProcessStartInfo psi = new ProcessStartInfo(@"\PathTo\programToRun.exe");

    new ProcessStartInfo()

    Dim info As New System.Diagnostics.ProcessStartInfo

    SystemRangeStartInformation = 0x0032,

        FileIdBothDirectoryRestartInfo = 11, // 0xB

        FileFullDirectoryRestartInfo = 15, // 0xF

        FileIdExtdDirectoryRestartInfo = 20, // 0x14

        FileIdBothDirectoryRestartInfo = 11, // 0xB

        FileFullDirectoryRestartInfo = 15, // 0xF

        FileIdExtdDirectoryRestartInfo = 20, // 0x14