<mime-mapping>
<extension>doc</extension>
<mime-type>application/msword</mime-type>
</mime-mapping>

word是可以的

<mime-mapping>
<extension>ppt</extension>
<mime-type>application/mspowerpoint</mime-type>
</mime-mapping>
可是我要是打开ppt文件却不行，怎么添加阿？
谢谢