Advanced Captivate Geek Question: Changing Caption Colors

I want to change the caption color in my button:
YOU MUST ANSWER THE QUESTION BEFORE CONTINUING.
I need a solid color button with a specific RGB value. Since I can't input that, here's my proposal/theory:
I want to create a BMP file and place it in the captions folder so that I can use THAT for my button.
I see in the folder of captions that there are BMP files and FCM files, each with the same name. I don't know what the FCM files are for
I want to create a BMP file with the precise color I need for my button and then place it in this folder.
Do I need to create a FCM file too? Do I need that? How do I do that?
