char *get_open_filename(char *filter, char *fname)
    {
        OPENFILENAMEW ofn;
        WCHAR szFile[MAX_PATH];

        HWND SitehWnd;
        SitehWnd = GetAncestor(GetActiveWindow(), GA_ROOTOWNER);

        string str_filter = string(filter).append("||");
        replace(str_filter.begin(), str_filter.end(), '|', '\0');
        string str_fname = fname;

        tstring tstr_filter = widen(str_filter);
        tstring tstr_fname = widen(str_fname);
        wchar_t *wstr_fname = const_cast<wchar_t *>(tstr_fname.c_str());

        ofn.lStructSize = sizeof(ofn);
        ofn.hwndOwner = SitehWnd;
        ofn.lpstrFile = wstr_fname;
        ofn.nMaxFile = sizeof(szFile);
        ofn.lpstrFilter = tstr_filter.c_str();
        ofn.nFilterIndex = 0;
        ofn.lpstrTitle = NULL;
        ofn.lpstrInitialDir = NULL;
        ofn.Flags = OFN_EXPLORER | OFN_FILEMUSTEXIST | OFN_HIDEREADONLY | OFN_LONGNAMES;

        if (GetOpenFileNameW(&ofn) != 0)
        {
            static string result;
            result = shorten(ofn.lpstrFile);
            return (char *)result.c_str();
        }

        return (char *)"";
    }