Ampersand in configuration files isn't escaped automatically

I used a data folder which had the ampersand symbol "&" in the directory address.

When I launch openmw.exe, with an active esp from that folder, it throws an error with the plugin file name saying the content file does not exist.

(RM-3243 from redmine: created on 2016-03-09 by NASSOOR ᠎R, , closed on 2017-10-16 by AnyOldName 3, relates #3045 (closed), duplicates #4157 (closed))