title: What is the best mime-type and extension to use when exporting tab delimited?
body: <p>I've come across the problem where Excel will not play nice with UTF-8 encoded CSV files. See this <a href="https://stackoverflow.com/questions/155097/microsoft-excel-mangles-diacritics-in-csv-files">related question</a> on Stack Overflow.</p>
  
  <p>I've followed the solution of exporting as UTF-16, however it seems that with UTF-16, the comma character doesn't work as a delimiter, only the tab character.</p>
  
  <p>However I can't find anywhere what the correct filename and mime-type should be for tab-delimited files. I found somewhere stating that it was application/vnd.ms-excel and xls. This works ok for Excel 2003 but 2007 does not approve.</p>
  
  <p>So what should it be?</p>