Here's the link:
https://www.dropbox.com/s/0vmp755fc6g9ped/DOS%20Heightmap%20Tool.zipIf you're a coder, consider this as public domain so feel free to modify it and redistribute at will.
I want to see what people have gleaned about the formats so far...
I'm sorry but you're going to be disappointed. My tool just overwrites the part of an existing "terrain.data" that contains the heightmap (this is just the first chunk, actually). The rest of the file that contains texture layers is kept unchanged and is not parsed.
On the other hand, you can find useful information about the PAK and LSB/LSX formats on the wiki:
http://divinity.gamepedia.com/PAK_formathttp://divinity.gamepedia.com/LSB_format
