title: File Encoding Issue when opening script that contains Blob
body: <p>When I load a value from file (an image) into a field with datatype Blob, then export it via Admin Tab -> Data Export and open it in an SQL tab i get a File Encoding Problem Message.</p>
  
  <blockquote>
    <p><strong>Unknown File Encoding</strong>   The file  has an unknown
    character set encoding. Please select the encoding of the file and
    press OK for Workbench to convert it and open it. Note that as
    Workbench works with UTF-8 text, if you save back to the original
    file, its contents will be replaced with the converted data.</p>
  </blockquote>
  
  <p>Below I can enter a Character Set Encoding Name. When I accept the suggested "Latin1"-Encoding the Image will be corrupted afterwards. </p>
  
  <p>The collation for the schema is utf8 but when I input utf8 in the above mentioned dialog it says</p>
  
  <blockquote>
    <p><strong>Could not Convert Text Data</strong> The file could not be converted from 'UTF-8' to UTF-8: Invalid byte sequence in conversion input.</p>
  </blockquote>