When a new version is installed, what does it do to the existing configuration files? Are system default files/entries created, or will existing configuration files be used by the new version?
The existing ygfconf.txt is not altered by the new installation itself, but the You’ve Got Files! program does copy it to a file named ygfconf.pre, re-parse it, and write it back (with the new version number at the top) as ygfconf.txt. If the installer does not find a ygfconf.txt file in the installation directory it does create a ygfconf.txt with the information that the installing person input during the install process.