xiaohu
支持呀，请查看MIME类型表，里面有添加扩展格式文件的信息，如果无法上传，请手动在类型中添加一下，
其中这一段是有的：
("application/msword", "doc");
("application/msword", "dot");
("application/vnd.openxmlformats-officedocument.wordprocessingml.document", "docx");
("application/vnd.openxmlformats-officedocument.wordprocessingml.template", "dotx");
("application/vnd.ms-excel", "xls");
("application/vnd.ms-excel", "xlt");
("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "xlsx");
("application/vnd.openxmlformats-officedocument.spreadsheetml.template", "xltx");
("application/vnd.ms-powerpoint", "ppt");
("application/vnd.ms-powerpoint", "pot");
("application/vnd.ms-powerpoint", "pps");
("application/vnd.openxmlformats-officedocument.presentationml.presentation", "pptx");
("application/vnd.openxmlformats-officedocument.presentationml.template", "potx");
("application/vnd.openxmlformats-officedocument.presentationml.slideshow", "ppsx");
