Yes, really, you should have mentioned that you are using "folk" software

Actually, you made a basic mistake. Understandable, given that today most people don't know wince like they used to
No setting in the sys file is required for the device to read the contents of the addons folder from the card. It is the basic mechanism built into every iGO exe (btw, this has been mentioned many times on the forum, even in the tutorial thread)
e.g., line
secondary_root="addons"
is absolutely superfluous, in fact wrong (because it conflicts with the built-in mechanism)