@zfigura I'm really sorry that this patch required so many reviews. I'll definitely pay more attention to formatting next time!
No need to apologize, thank you for your patience working with the review process.
One more comment which I had missed unfortunately, the commit message needs fixed formatting, like:
"kernelbase: Implement CopyFile2()."
I don't think you need the part about reimplementing CopyFileEx().
Otherwise the patch looks good to me.