code: @Nonnull
    @ReturnsMutableCopy
    public ICommonsSet <IMimeType> getAllMimeTypesForFilename (@Nonnull @Nonempty final String sFilename)
    {
      ValueEnforcer.notEmpty (sFilename, "Filename");
  
      final String sExtension = FilenameHelper.getExtension (sFilename);
      return getAllMimeTypesForExtension (sExtension);
    }
docs: Get all mime types that are associated to the extension of the specified
  filename.
  
  @param sFilename
  The filename to search. May neither be <code>null</code> nor empty.
  @return Never <code>null</code> but maybe empty set if no mime type is
  associated with the extension of the passed filename.