Re: On Windows 7 in 2015 ....
"Files are locked..."
No, files are locked if the application requests a lock when opening them.
Or the application doesn't ask for a lock and doesn't get one.
That is sensible and extremely useful.
It is generally bad to delete a file from under the user, so many editors (Word etc) do ask for the lock.
And many don't. The decent text and code editors don't, instead opting to be notified if the file is changed or deleted out from under it.