winscp copy -opening the file at destination during copy

I am copying large file using winscp from unix server to laptop. After copy is completed at my laptop I see file accessed property is greater that created date. What could be the reason for the same? I have not accessed the file during copy to my knowledge. Also what happens when you open file at destination during copy in progress. Will it corrupt the file. Version of winscp used is 3.8.0.

Your have posted the same question on Stack Overflow and Super User before. And you have never provided the information I have asked for. Both question were meanwhile deleted as you have abandoned them.