Confirmed - cause found, patch not written yet.

Two things are missing: the inventory refuses to 'use' the guide because of its item category, and no book-reader window exists. The book text lives in Item.wz and the window art in UI.wz/UIWindow.img/Book - neither is extracted yet.

Moving it out of OPEN so the list reflects reality: this one is pinned down to exact files and lines, so what is left is writing and testing the change, not working out what is wrong.

Fixed in 7be23d95, with a follow-up in 79ee3daf.

This was two separate faults, neither one caused by the other.

1) The bag had no verb for the book. The bag decides what a double-click does by item type - use items, setup items, pets, cash effects, prepaid cards, otherwise 'is it equippable'. The Beginner's Guide is category 'etc', so it matched nothing and returned silently. The item's own v83 description literally ends 'Double-click on the item to open the book.', so it was telling you to do something that could not work.

2) There was no reader window at all. That part is purely client-side - the private servers only GRANT the guide, they ship no handler for opening it - and both halves were still sitting unextracted in the WZ.

Fix: the page text was extracted from the real v83 data. 4161001 has 20 pages and 49 lines, and 91 of the 0416 items carry a book, so they all work now. The reader window and its page turning were built from the v83 art, and the bag now recognises any item that has book pages.

Follow-up 79ee3daf: ESC was closing the bag out from under the book, so ESC now closes the book first.

Retest: double-click the Beginner's Guide in your ETC tab, page through it, and close it with ESC.