private boolean isMainSubtype() {
      FileNameMatcher subtypeMatcher = OSAssociateFileTypesUtil.getSubtypeMatcher(myFileType);
      return mySuperType != null &&
             subtypeMatcher instanceof ExtensionFileNameMatcher &&
             mySuperType.getDefaultExtension().equals(((ExtensionFileNameMatcher)subtypeMatcher).getExtension());
    }
private boolean isMainSubtype()