Could it be the file is compressed with Deflate64?
It's almost identical to the standard deflate but with some improvements.

That's normal for LZW. The maximum length is probably 13 or 14 bits.

No.

Just a note: The first bit and next 8 bits probably make up a 9bit code word.
"100000000" then indicates to clear the dictionary. Codes < 256 are literals and codes >= 258 indices into the dictionary.
You can probably use an existing LZW decompressor and play around with it.

Seems to be LZW based.

Sorry, there's nothing usable yet. It's been on my todo-list since back then
But I've located the decompression code, it's "just" a matter of writing the code

Hi, No worries, I've just been busy with some other stuff. :) I've made a little sprite viewer some time ago, it works quite well so far. There's still the problem with the different LZW values...probably I'll just have to hard-code a list of filenames and note which version of the algorithm to use....

That seems to be a DAC VGA palette. The range there is from 0..63, not from 0..255. You need to shift every byte left by 2 to adjust the range, the palette should be correct then.

Hallo, hier ist noch'n Deutscher

Sorry that I haven't released the decompression tool yet. It works so far but crashes with the problem I mentioned before (the different max. dictionary size in the LZW decompressor). I want it to detect automatically which value is used somehow. And yes, it's basically possible to modify the graphi...

I found out more. The map looks much nicer now

In MAPADAT.Z66 are the animations of the tiles. These values translate to the actual tile to use.
Well, more tomorrow I hope.

Not much. The only difference is one value used in the LZW decompression. It's the maximum dictionary size. In the code I currently use it's max. 13 bits, in the other code 14 bits. That's all I can see so far. I just threw together a sucky map viewer . Works ok so far but some tiles seem wrong. I u...

It's almost done but as you said, something popped up :) I'll try to get it done this week. Also I need to test it with all the files. There's a slightly different decompression routine in the Exe and I'm not sure if it's used. If it is used, then there's no way of telling which routine is used on w...

LZW it is. More tomorrow