title: Lua, io.input() can't find file
body: <p>I have <code>myfile.txt</code> sitting in the same directory as my lua file, yet when I call <code>io.input("myfile.txt")</code> I get the error <code>bad argument #1 to 'input' (myfile.txt: No such file or directory)</code>.</p>
  
  <p>I don't see how this can be going wrong, have I misunderstood Lua's I/O?</p>