When the file opens, download the current version from ftp

I am working on my Remote Development server.
When I open a file in my project, I want the file on the remote server to automatically download this file if it is more up-to-date than my computer. How can I do this?

I have selected Notify of remote changes in Deployment -> Options but this only gives notification. Every time I open the file, if the file on the remote server is more recent, I want it to download it directly.