My project is using std::wstring extensively and I have been able to get both the text and xml serialization archives to work with it. However, I am getting a stream_error when trying to deserialize objects written to a binary archive. I think the serialization may be missing some objects. I have tracked the problem down to serializing a std::map<std::wstring, shared_ptr<IddKey>, iStringCompare> where IddKey is a class that supports serialization and iStringCompare is: struct iStringCompare{ bool operator()(const std::wstring& x, const std::wstring& y) const{ return boost::lexicographical_compare(x, y, boost::is_iless()); }; }; I have tried to replicate this problem in a simple test case to submit but have not been able to reproduce it outside of my real code. Here is the code that serializes to a binary archive: boost::filesystem::wpath path = iddPath; path.replace_extension(L"idd.bin"); { boost::filesystem::ofstream ofs(path); boost::archive::binary_oarchive out(ofs); out << iddFilePtr; } IddFilePtr newIddFilePtr; { boost::filesystem::ifstream ifs(path); boost::archive::binary_iarchive in(ifs); in >> newIddFilePtr; } I am not using binary_woarchive or binary_wiarchive because they don't compile with shared_ptr serialization and I have seen that you are not really supposed to use them. I am using the wstring versions of the text and xml archives that are working. Does anyone have any suggestions on how to track down my problem? Dan