title: Undeclared identifier TEncoding delphi7
body: <p>Hi i want to use TEncoding to convert Tbytes to utf7  but when i use TEncoding
  delphi gives following error.</p>
  
  <p>Undeclared identifier: 'TEncoding'</p>
  
  <p>i am using delphi 7.</p>
  
  <p>what to do??</p>