def find_bookmark_file ():
    """Return the bookmark file of the Opera profile.
    Returns absolute filename if found, or empty string if no bookmark file
    could be found.
    """
    try:
        dirname = get_profile_dir()
        if os.path.isdir(dirname):
            for name in OperaBookmarkFiles:
                fname = os.path.join(dirname, name)
                if os.path.isfile(fname):
                    return fname
    except Exception:
        pass
    return u""
Return the bookmark file of the Opera profile.
    Returns absolute filename if found, or empty string if no bookmark file
    could be found.