Why can't I open the document of National Patent Information Center?

The reasons why the files downloaded by the National Patent Information Center can't be opened are: incompatible file formats, file damage or download errors, security restrictions or settings.

Incompatible 1. file format: First, determine whether the downloaded file format is compatible with the currently used software.

2. File damage or download error: Sometimes there may be errors in the download process, resulting in file damage or incompleteness.

3. Security restrictions or settings: The computer may have set security restrictions to prevent some files from being opened or accessed.