I'm uploading this portable software I found on google because I couldn't find any website talking about ARGB and I got confused a lot about that lol. So if you're a noob like me then here's your solution. It's easy to use and it will generate the 'ARGB' you need.
How to use?
Just play with the arrows 'til you find the color you're looking for.
TIP: (Because I had no idea where to put the numbers )
The correct order is: A,B,C,D
An example will be: <TextColor>255,255,255,255</TextColor> which will be White.
Credits to: Eyeshot Softworks