In this case, it may be that downloading tools such as Thunder are installed on the computer, which leads to confusion in downloading files. Baidu Library suggests not to use Thunder to download documents, use the download tool that comes with the browser, turn off the browser monitoring option of Thunder, or hold down the ctrl key and click the download button when downloading.

Suggested solution:

1, clear the browser cache.

2. If it is IE, it is recommended to reset the browser, that is, restore the default settings and turn off the monitoring of the browser by Thunder.

To turn off Thunder's monitoring of browsers:

Hold down the ctrl key, and click the "Download" or "OK" button in the library download prompt box to cancel the monitoring function of Thunder/Express software.

In this way, the downloaded format is the correct format.