title: How to reference a cell or range in an external spreadsheet?
body: <p>I have one spreadsheet already saved with some data, then in a new spreadsheet in the same folder on the same hard drive I'm trying to reference a cell in the previously saved spreadsheet file.</p>
  
  <p>From what I've read, I'm supposed to click <code>Insert</code> on the top menu, then <code>Link to External Data</code>, then choose the file and cell(s) in the External Data popup dialog.  But after I choose the file, the OK button remains disabled, and the "Available Tables/ranges" box remains blank.  This happens both in the Linux and Windows XP versions.</p>
  
  <p>What am I doing wrong?</p>
  
  <p>If I select the "Update every" checkbox there is no difference; I still can't do anything because the OK button remains disabled.</p>