theVal = SELF
' see if the value of the field is not null
if (not (theVal.IsNull)) then
  ' if the file listed in the field exists, then play the video
  if (File.Exists(theVal.AsFileName)) then
    ' use the path to the video player executable
    System.Execute("c:\Tools\iview\i_view32.exe"++theVal)
  else
    ' if the file doesn’t exist, tell the user
    MsgBox.Warning("File "+theVal+" not found.","Hot Link")
  end
end