I use Photoshop CS to open original BMP (monitor.bmp), there are four channels in Channel tab of Photoshop include: RGB, Red, Green, Blue, Alpha 1. I try save this BMP (a new copy) with options: + Format: BMP, Save Alpha Channel. + OS: Windows + Resolution: 32bit RGBA + Name: temp.bmp. I use Rehack to replace original BMP with temp.bmp but get a message error: Please help me using which options?