case REMOVEALL:     
      
   // Ensure that all previously installed features are removed
   // for media that supports updating.
   MediaGetData( MEDIA, MEDIA_FIELD_MEDIA_FLAGS, nMediaFlags, szIgnore );
   
   if( nMediaFlags & MEDIA_FLAG_UPDATEMODE_SUPPORTED ) then
      if (Is(FILE_LOCKED,"<Specify the fully qualified name of the file>") )then 
        MessageBox("File is in use, Uninstall setup will now terminate. Please close this program and start the uninstallation again",0); 
        abort;
      else 
        MessageBox("File is not in use...press Ok and continue with the uninstallation",0);
      endif;

FeatureRemoveAllInMediaAndLog();

    else
      FeatureRemoveAllInMedia();
    endif;