Maybe,the conclusion is: the issue of being unable to modify the author and other property information of the file was due to “preview window”, which has nothing to do with the file type itself (in this case) but is related to whether a preview window option is selected.
When “None” is selected, the author and other property information of the file cannot be modified;
When “Standard” is selected, the author and other property information of the same file can be modified.
Honestly, this software setting is somewhat confusing.
Finally, thanks for both of your help.
