Here is Wondrous Lands internal files. Unfortunately, part of the game logic is hardcoded(like like abilities parameters), but there are an information that could be interesting:
Ability images, Global spell images, Gods images
https://www.dropbox.com/s/pp983a6w4lze1yf/AbilitiesSpellsGodsImages.7z?dl=0
Resources
https://www.dropbox.com/s/qkby7yqkjq1zi45/resources.7z?dl=0
Notepad++ is the best free tool to work with xml files, but it also could be opened using notepad.
Xml files detailed description:
abilities.xml - heroes abilities.
achievements.xml - game achievements
addplaces.xml - places that heroes can visit
altars.xml - gods altars
artefactNames.xml - artefact names
baseparams.xml - base parameter descriptions
camps.xml - mercenaries
commonMonsters.xml - non-humanoid monsters and it's parameters
enchants.xml - enchant names
equipment.xml - available equipment
events.xml - ambushes ect.
globalEffect.xml - global effects
heroes names - generated hero names
humanoidMonsters - humanoid monsters and it's parameters
infoEquip - internal stuff to view equip
interfaces.xml - internal stuff for UI
map.xml - internal info for generating map
mercenary.xml - mercenaries description
monsterFeatures.xml - monster features description
quests.xml - quests description
questText.xml - messages for quests
races.xml - races description
skills.xml - skills description
speakingStruct.xml - monster messages on a global map
testMap.xml - test map for internal testing
timer.xml - timer messages
tooltip.xml - tooltip messages
triggerPlace.xml - places that heroes can visit
unitSounds.xml - game sounds
Also If you need additional info here is my email: drakonian_lord@tut.by