When you see a file like , it’s the third chunk of a larger set. The full archive will contain a part01 and part02 (and probably a final .rar or partNN file). The data is not usable on its own; the extraction tool must see the whole sequence.
You cannot open this file by itself to view the content. Because it is a "split" archive, you must follow these steps: VENX-267-u.part03.rar