I would like to change the desktop icons text color. But by changing text color, white shadow appears.. I know how to change all the other colors of the theme, but this shadow is not knowledge, part of "/home/"user"/.kde/share/config/" folder. The shadow appears when change the text color darker than the (RGB 193,193,193). I've tried to look for desktop settings menu, without success. How to turn off the shadow, or even change the color? Thanks!

I suspect the text shadow is likely automatically provided by Plasma to ensure the text has adequate contrast against the background. Is your background quite dark, and does switching to a lighter coloured background have any impact?

Yes, my background it's black, but changing the lighter does not seem to matter. Btw that the shadows are visible in all the widgets texts, which have the same text on the desktop.

Try right clicking in Folder View -> Folder Settings -> Icons -> uncheck "Shadows".