We agree - we don’t know how to interpret the .seg file either. It looks like the event code “0” may contain the time stamp for both an impedance check AND the new segment. If so, the new segment would be at every odd numbered event currently coded under the “0” labeled event. I’m also providing a link to another file that is generated when we export using the BrainVision file type. This may have additional information regarding how the events are being coded in the .evt and/or .cnt files. Hopefully this will help!
http://aeddins.myweb.usf.edu/files/MA_2017-11-17_13-55-55.txt