【求助】How to create "index.mnu",Pro/e fan pls

PTC的文档里提到，安装多个库（如标准件库、管道库等）时需要配置INDEX.MNU,原文如下：c. An index.mnu file must be created if multiple libraries are installed. Refer to the Pro/ENGINEER Introduction to the Libraries for more information on how to create an index.mnu file.
  
不知道这个文件是什么格式，也没找到所谓的“Introduction to the Libraries ”，请高手指教，谢谢