Why I write this?
Because the MegaPack doesn't works well with Cossacks, when importing Poser unit graphic into Cossacks, there are something different to importing into AC.

Back Ground information:
First of all, please make sure that you have read these 3 tutorials already:
http://cossacksworld.ucoz.co.uk/index/0-151
http://swordandarrow.ucoz.com/index/adding_a_new_unit_to_the_game/0-31
http://swordandarrow.ucoz.com/index/megapack/0-17

This guide is not a full tutorial, it only contains some points you need to notice while importing unit graphic into Cossacks 1 instead of AC.

Steps:

Step 1:
Render your unit model 4 times bigger than usual C1 units in your Poser. You will get frames like this:


Step 2:
Switch your GpArch into "FOR AC".

Step 3:
Open your MegaPack, pack up the frames with this option, do not select any palette:


Step 4:
Open your GPview, view the GP you created, you will see this:


Extract it with your GP view, you will get these:


Step 5:
Switch your GpArch into "FOR COSSACKS".

Step 6:
Open your MegaPack, pack up the Dopp.lst(or your unit file name) you have just Extracted, use this option:


Step 7:
Open your GPview to check the new GP:


It is done! Cheers!