Occurence

In the Discover configuration folder, there is a Discover.prj file. But when I add a custom projection, it does not appear.

Solution

This is not the Encom.prj. Do not add custom projections here. That is located in
C:\Users\USERNAME\AppData\Roaming\Encom\Common\Projections

See the related article for more information.

This file is for the Favourite Projections tool, which displays the Favourites category within some Discover projection selection dialogs.