title: Running a single instance of software for multiple selected files by right click menu of windows using NSIS installer
body: <p>I have a software which runs fine for a single file using the right click menu of windows, but opens the multiple instances of the software when i select multiple files and click on the command from right click menu.</p>
  
  <p><img src="https://i.stack.imgur.com/3fRMq.jpg" alt="enter image description here"></p>
  
  <p>My current script for the command is this: </p>
  
  <pre><code>Section "Integrate Shred" SectionShred
      # register file association verb
      WriteRegStr HKCR "AllFileSystemObjects\shell\shred.bleachbit" "" 'Shred with BleachBit'
      WriteRegStr HKCR "AllFileSystemObjects\shell\shred.bleachbit\command" "" '"$INSTDIR\bleachbit.exe" --gui --no-uac --shred "%1"'
  SectionEnd
  </code></pre>
  
  <p>Help me in editing above script so that a single instance runs for multiple selected files.</p>