a problem with files windows10

I try to open a file that I downloaded from the Sentinel 3 satellites, but it always gives me this message

Can you please name the product ID of the data you wanted to open and the exact text of the error message?

When I open any file I always get this error message and I have reinstalled the program more than once but to no avail

this the name of file i wanted to open

please see here:

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but i don’t know how to work with this program pr how we perform data

This forum is about SNAP toolbox, but the RUS tutorials on the BRAT software are a good start: RUS webinar: Altimetry with Sentinel-3 using BRAT - Part 1 - OCEA06 - YouTube