It looks like that dps to xls conversion is in most cases searched by users that have old .dps presentation files made using the Kingsoft Office and just need to export it to something else, in this particular case Excel format.
Unfortunately, the software has been discontinued years ago and support for its formats eventually disappeared. Thus your best option actually is to find either the original software on the internet, or look for earlier versions of competitive presentation tools that might have supported DPS format.
Updated: September 11, 2023