Amber Coloured selection handles?

In a file not created by me (but I need to work on it) an object, when clicked appears with "amber selection handles", instead of the usual black or white ones?

I need to edit it, i.e. change the colour of the outline in question, but when picking the "shape-tool" ("umriss" in German), even so changing the colour of the line and clicking "OK" it does not change?

Also: Even so I have "ungrouped" everything, it does not look like it is a vector-graphic at all - or else, when clicked it would show the multiple node-points?

Anyone among you fine ladies and gentlemen who know Corel so much better than I do, who can tell me what I am looking at, and if there is a way to "edit" these lines (or vectorize them to begin with?)