...and please just issue the standard overwrite warning to the user if they attempt to leave the name as-is. Forcing the user to use the keyboard to manually erase " copy" from the end of every filename is such a pedantic waste of time, especially given that:
1. We're purposefully inside the Save-and-Replace dialog, and probably already know exactly how we want to tweak the part/filename and have no need to have " copy" suggested unhelpfully for us.
2. Everyone already knows the convention of the standard overwrite warning during Save-As and is used to handling that pop-up message.
But especially:
3. We're all human... and inclined to forget that the " copy" is there becuase it is only added when you've last Saved-and-Replaced in the same directory as the original file, leading to uneccesary filesname disorder when we've got " copy" appended to parts in our filestructure.