Ⅰ 任务栏的pdf图标变成jpeg的图标了。怎么弄啊网上找了好多方法也没解决啊。我是win7高级版的。
右键这个图表，选择属性，选择更新图标，然后选择PDF安装目录，找到PDF程序就可以了。
Ⅱ pdf文件:下载pdf 文件打不开，删也删不掉
总的来说，这些PDF是个死文件，你可以将除了这些不用的文件之外的有用文件全部剪切到外面的新的文件夹，然后将死文件所在的文件夹一起删除就可以了。你需要的PDF再重新下载。
下文是别人地方拷来的，亲测有效。
My solution for this problem:
1. This kind of dead files are proced by incompletely downloading of the files from the websites.
2. When you download a pdf file from a website, rename and then save it, if the web page does not show change of the name of the pdf file, this indicates that the file have not been completely downloaded. You should immediately delete it (its size is 0 Kb.) from the folder where you save it and re-download it completely.
3. You can cut the folders in all hierarchies and files in them together or separately and paste them in other/new driver (or in new folders in new driver), since the dead files can not be moved, you can filter all dead files and re-download them according to your needs and save the in the new folders in new driver. Then you can delete the older folders in all hierarchies together with this kind of dead files completely without trouble.