The solution would be, to extract the .gp files with GP arch with the cossacks palette ( folder 0 & 1 for Cossacks subfolder in GP Arch) and repack the frames with MegaPack with folder 0 & 1 for American Conquest and then put them back in the game trough a mods.gs1 or patch.gs1 or alike file.

Just ask if this doesnt make sense.

I did it get it working and the palisade now looks like it did in Cossacks.

I also tried to change the tone of the color so that it would fit better with the darker plainer colors from AC but then when I tried to compile the files into a gp the program crashed.

Any idea why changing the colors made it not compile?

Maybe it was because the bmp editor I used saved it in 8 bit while normal AC gp files are 24 bit?

Thanks, even if I can't change the color I am happy to them in.

2 points. You are correct about the bmp's having to be 24 bit.
Secondly when packing the frames with megapack you must choose pallete 1 for AC & pallette 2 for cossacks.

Maybe something bad happened while I was converting the bmp's but they still look fine so I don't know.

and did u give it a lime green background, and list them right.

Non progredi est regredi

There is already a list file with their numbers so I didn't need to change it.

which software did you use to change the tone off the palisade and / or "convert" them to 24 bits?

what should I use?

That's interesting Michael, I have never tried this.

Added (13/April/2011, 3:11 PM)
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GiMP is excellent and it's free, I have been using it with the S.A.M. mod

http://www.gimp.org/