When uploading image files or EXCEL templates with SMW0, if the MIME TYPE is not maintained, the system will give a prompt.

As follows:
“There is no MIME type assigned to the object .XLS”, you need to maintain the MIME TYPE of the .XLS file,
open SMW0

select the second binary data, and then go to the

menu “Settings”-“Maintain MIME type

Click “Add” to add a type: TYPE: EXCEL, EXTENSION: *.xls

Or TYPE:  EXCEL  ,    EXTENSION :  *.xls,*xlsx

save and re-enter.