@amerika
It did the same for other files too.
I'm guessing it's cause NTFS has some permission/ownership properties associated to files, and exFAT doesn't. So you lose that when copying over, but this notification is a new behavior as far as I can tell.
@icedquinn
I'm just surprised that Windows added this warning. Don't remember ever seeing it. Although, to be fair, it's not like I've been using Windows much lately.
@mr64bit
Haven't used Windows for a while, this is the first time I've noticed this. I've used Win10 plenty years ago, so I doubt it was introduced with its launch, but somewhere along the way.
@alyx
It's saving you from LibreOffice. Let it do its blessed work.