That is not an XLS file but an HTML file. Such are generated by some applications and web pages using the incorrect file extension. While Excel will import them properly, OpenOffice and LibreOffice Calc will not.
If you use LibreOffice see
Inserting External Data in Table (WebQuery) - LibreOffice Help[
^] for a solution (I don't know if that works for OpenOffice too).
Another solution is opening the document in Writer, selecting the table (the text enclosed by the
table
tags including the tags), copy the selection to the clipboard, and paste into an empty Calc document. Use
Edit - Paste Special to get additional options for pasting HTML.