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Thanks to all for your replies.
For some weird reason though, after I change the option for the font size in my Windows, it actually changes the font size of all tooltips except in Avast… ??? Hmmm… Maybe I also have to restart the PC so Avast recognizes it. I’ll experiment some more…
About my skin, I don’t know what are the rules in order for it to be accepted. So I’ll keep searching in the threads to see.
From what I know now all existing skins weight between 0,8 Mb and 2,6 Mb. Mine might not be accepted for one simple reason : it already weights 14,5 Mb. 
But of course, it already contains a lot more animations and graphics. On the worse case, I could maybe make it available on my personal site. But it’s not over yet.
I expect to finish it in about one month. I’ll keep you informed if anyone is interested.
Going back to my skin builder program