namespace lyx {
-bool openFileWrite(std::ofstream & ofs, std::string const & fname);
-bool openFileWrite(odocfstream & ofs, std::string const & fname);
+namespace support { class FileName; }
+
+bool openFileWrite(std::ofstream & ofs, support::FileName const & fname);
+bool openFileWrite(odocfstream & ofs, support::FileName const & fname);
} // namespace lyx