Google is your friend om...
1. http://www.rpgmakervxace.net/topic/168-windowskin-generatorsplitter/ dan cara nge-convert ke vx ace : http://windowskins.rpgmakertimes.info/tutorials/how-to-rmvx-to-rmvxa-windowskin-tweak/
2. Kalau gak salah, masukkin file windowskinnya di folder Graphics/System terus ganti namanya jadi "Window".
Ini works di VX, tapi blom coba di VX Ace. Confirmed bisa di VX Ace.