uploading .xls files, zip files that are not plug in, widgets.

Trying to upload a realtor IDX zip file. containing excel sheets that would allow me to place a search form on a page, where user can place their property criteria in, i.e type of property ( single family, townhome, condo, etc.) amount of bedrooms, bedrooms, square footage, area of interest, price range, etc., etc, etc….

My site is https://RealtorRonW.com. the property searching is set up by iframes, also have a subdomain https://rwolchesky.wordpress.com, i am working on RealtorRonTeam.com

I tried using the zip file and won’t allow me, then i unzipped it and still unable to upload…from what i see, they are htlm, and css files. and I am guessing i have to convert them into a plugin in order to upload them????

I appreciate any help or sense of direction. I do have the feed to the MLS…which is the database the information will come from. It is a live feed…so, i think the form would do nothiing more but request the information from the MLS, and the MLS would respond with the information asked for.