该程序可以查询输入的文件扩展名的文件类型说明，作为开发者，主要是参考他内部的字符串搜索和匹配的技巧，值得一看-inquiries, the program can import file extensions descr iptions of the type of document, as a developer, He is the main reference to the internal string searches and matching skills, an eye-catch