The custom objects file (war3map.w3o)

This document defines the common file format shared between these files:

File extension	Object type	Object IDs location	Modification IDs location
`w3u`	Units	Units\UnitData.slk	Units\UnitMetaData.slk
`w3t`	Items	Units\ItemData.slk	Units\UnitMetaData.slk
`w3b`	Destructibles	Units\DestructableData.slk	Units\DestructableMetaData.slk
`w3d`	Doodads	Doodads\Doodads.slk	Doodads\DoodadMetaData.slk
`w3a`	Abilities	Units\AbilityData.slk	Units\AbilityMetaData.slk
`w3h`	Buffs/Effects	Units\AbilityBuffData.slk	Units\AbilityBuffMetaData.slk
`w3q`	Upgrades	Units\UpgradeData.slk	Units\UpgradeMetaData.slk

File format

Size	Description
`int`	number "NMOD" of objects
`object[NOBJ]`	NOBJ number of objects

Size	Description
`char[4]`	original ID
`char[4]`	new object ID (0 if original objects table)
`int`	number NMOD of modifications
`modification[NMOD]`	NMOD number of modifications

Size	Description
`char[4]`	ID
`int`	modification type

If the file is modifing doodads, abilities or upgrades:

Size	Description
`int`	level (variation for doodads)
`int`	column in AbilityData.slk (only used by abilities)

Always followed by

Size	Description
`modification type`	modification amount
`char[4]`	either equal to 0, original ID or new ID