IMPORTANT:
the Lord weapon in each file replacing katana...so if you want to replace it with another weapon...just rename the katana.dff and katana.txd with another weapon name according to the name in gta3.img, and not only that...you also have to rename the icon name in the txd file...you can change the name of the icon in txd workshop or Magic txd.
renaming it is by typing the name of the weapon you want to replace it with, then adding the word 'icon' in front of the weapon name(without space)
for example like "katanaicon","baticon","knifecuricon" etc.

and one more thing, the weapon is only suitable for the Lord, which means is that the axe only fits in the Lord's hand and doesn't fit in other characters

Alright...I think that's all...Thank you for your attention!