title: Inno Setup Prompt for external file location
body: <p>I currently use <code>[Files] Flags: external</code> to import user data into my installation, which is working. </p>
  
  <p>I now need to prompt for a specific external file during the installation. </p>
  
  <p>Use case:<br>
  We install software that requires a license file (not to be confused with the license agreement). I want to prompt the user for their license file. Once they provide a file, it would be copied to the <code>DestDir</code>. </p>
  
  <p>I'm looking for a something like <code>[Files] Flags: PromptForFile</code> or a routine that achieves the same. Has someone already solved this?  </p>