title: Using a Qt Help file in an installed app
body: <p>I develop a Qt application for windows, and the help file was generated in qch format with the qhc collection file. The help was embedded in the application using QHelpEngine. The help files are put in the same folder as the application executable, and this works well for dev builds.</p>
  
  <p>But when we deploy the application in "Program Files" using a WiX installer, the documentation works but the search function fails, and I get a warning:</p>
  
  <blockquote>
    <p>virtual void fulltextsearch::clucene::QHelpSearchIndexWriter::run():
    Failed because of CLucene exception.</p>
  </blockquote>
  
  <p>On the dev build, it seems that CLucene create some index files in the help file folder. Here it cannot, since the help file is in the installation folder, and the standard user cannot write there.</p>
  
  <p>Is the error related to missing index file creation rights? How can I make CLucene write to the User folder instead?</p>
  
  <p>Thanks</p>