What determines the order of the maps in "create new game" menu?

[tinkthank]

I tried and tried and tried, but can't figure it out: What determines the order in which the maps from which you can choose a new game appear?
I checked my folder, it can't be alphabetical, it can't be size, and it can't be "date Last changed". That's all that my windows explorer offers me.
I tried changing their names (e.g. from "urgaia.map" to "1_urgaia.map" or "urgaia_X.map"), but haven't had much success.
I basically just wanted the scenarios to be under their respective maps (urgaia, eye, cradle (homemade one), etc.), and the Illwinter ones first, or whatever.

Thanks in advance