ummmm, digging inside I think the order in some folders comes from:
/Applications/BA2.app/Contents/Resources/DATA/TEXT/TEXT1.TXT
where some objects folder are enumerate, for example
IDS_O_desert,"Desert Objects",
IDS_O_desert_concrete_at_bunker_desert,"Large Bunker",
IDS_O_desert_concrete_bunker_desert,"Bunker",
IDS_O_desert_covered_bunker_desert,"Covere Bunker",
IDS_O_desert_crates_desert,"Crates",
IDS_O_desert_desert_boulder1,"Boulder",
So, in the Editor, the first Desert object is "Large Bunker," followed for "Bunker", an so on.
But this do not apply to all folders, and the most bizarre is that the order is NOT the same in all computer, even with the same OS version, see the images.
BA is a surprises box!
iMac shows Russian objects ordered:

- Editor.jpg (91.21 KiB) Viewed 11038 times
Powerbook doesn't:

- Editor PowrBook.jpg (89.15 KiB) Viewed 11038 times