libwps无法解析doc文件

librevenge::RVNGFileStream stream("E:/QtProject/wpsfile/testwww.doc");

libwps::WPSKind kind;

libwps::WPSCreator creator = libwps::WPS_MSWORKS;

bool needEncoding = true;

const libwps::WPSConfidence confidence

= libwps::WPSDocument::isFileFormatSupported(&stream, kind, creator, needEncoding);

使用开源库libwps-0.4.11在windows msvc2019 x86编译成功后，建立工程解析doc文件，按照libreoffice里的写法，写下这段代码，但是 libwps::WPSConfidence枚举永远是 libwps::WPS_CONFIDENCE_NONE的，解析不了，求各位大佬指教为什么会解析不了呢？