- Good to see that you like the mod. But the mod totally redesignes gameplay and nations. So I guess vanilla to mod change would've been nicer for you....but I am glad to see that you like it. .
The mod is still under development, so changes are not final.

AI.dat
defines Difficulty, Nations and Peasants
DF.dat
for difficulty. Numbers xx nn yy etc:
Its in order of the difficulty and controls the time required for AI to build units. Its roughly an AI time enhancer constant.
0 = instant AI build --> Impossible Difficulty
256 = normal build time
1000 = extended

I advise you to take utmost caution editing these.
Another point is to use "Wordpad" if you don't wanna take risks.

About UnitAbilities,
well you need a lot more knowledge about the game and components before you can start making your own spells and abilities.

Hope this helps. . You can also report any glitches or problems you can find.

"A Hopeless heart is the Devil's workshop"

If you are asking on how to spawn the build units.
Go to Data\Nations\XX\xxx.nds
where XX means whatever nation you are looking for - DR for Elves, IC for Cryo race, ME for Mechanics, UN for Undead and SO for Sols.

First make sure that the building is defined in the XXX.nds (nation description segment/sector/section)
look in the [MEMBERS] section for this.
NB: The nds lists them in the Game ID format. To Find the game ID of the building you wanna use
-The Game ID is the name of the md file in "Data\(units)" folder, Look in Text\text_02.txt and see what is the md name first. The md name and game name are written there

When all is done
- Look up [FIXED_PRODUCE] section inside the nds (scroll down from the MEMBERS section)
- Add the building ID, add a space, add the number of units you want to produce from the building
- Next line, add the Unit's Game ID add space and then add 0 0 A (for 0th row , 0th column, A is meaningless in HOAE), if you have more than one Unit, add them line by line, the 0 0 then would become 0 1 for 1st column etc)

eg:

[FIXED_PRODUCE]
%BuildingName%(nation ID) %number_of_units_that_can_be_trained%
%Unit1%(nation ID) %row% %column% A
%Unit2%(nation ID) %row% %column% A
.....
.....
.....
%Unit-n%(nation ID) %row% %column% A
TestUnit(XX) 2
Unit1(XX) 0 0 A
Unit2(XX) 1 0 A

General Format is in yellow.
All these are files stored under ALL.gsc, patch01.gs1 etc: so extract them first using GSC tool from the site.

"A Hopeless heart is the Devil's workshop"

This is an md parameter.

"A Hopeless heart is the Devil's workshop"

UndBCem (A) 1 0 A --> wrong
UndBCem(UN) 1 0 A

%Unitname%|no_space|(nationID) %row% %column% A

"A Hopeless heart is the Devil's workshop"

Added (2010-09-21, 0:44 Am)
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But 1 and 0 have any meaning ?

But for costpercent....