docs: private boolean checkFile(String pstrFile)
      {
          boolean blnRet  = false;
          File    objFile = null;
  
          try
          {
              objFile = new CSFile(pstrFile);
              blnRet = (objFile.exists() && objFile.isFile());
          }
          catch (Exception e)
          {
              blnRet = false;
          }
          finally
          {
              if (objFile != null) objFile = null;
          }
          return blnRet;
      }