The funny thing is.....
I've read these "Library Priority List" recommendations before....
...and to tell you the troof...
.....my Library insertions are dotted at random, all over the place, and it doesn't seem to make any difference to the loading/running of my FS 2004.....

...!
Each new addition is automatically popped on TOP of the list, and I tend to leave them there without any observable problems.
..but it would be nice for a knowledgeable, definitive explanation of the correct method, from top to bottom of the list...

...!
Paul...G-BPLF...FS 2004...FS Nav...on the "Wanted" List... 8-)...!
Win 8.1 64-bit. DX11. Advent Tower. Intel i7-3770 3.9 GHz 8-core. 8 GB System RAM. AMD Radeon HD 7700 1GB RAM. DVD ROM. 2 Terra Byte SATA Hard Drive. Philips 17" LCD Monitor. Saitek Cyborg X Fly-5 Joystick. ...and a Briggs and Stratton Petrol Lawn Mower.