Update: Yes, I know there are similar questions on SO, but the solutions don\'t work either.
I want to change SVG\'s color, I mean paths\'s color, n
What happens here is that the object is not a simple path, but actually the whole "stroke" has been transformed into a big object. This may happen when you export objects with fancy (or not so fancy) brush settings from various drawing applications. You can also get the same result with the Outline feature in Adobe Illustrator, IIRC.
To avoid this, edit the original object in its original illustration software and try the following: