Convert fig to rgbo

What is the difference between .fig and .rgbo?

Description: This is a file used for creating line plots in the form of vector images. They include text objects, splines, forms, arcs, lines and arrows. It can contain a set of colors, images and sketches. It was initially developed for the Xfig drawing program, but today it’s used in other drawing editors.; Format for representing colors in the three primary colors (red, green and blue), each of which has 255 gradations. In contrast to the standard RGB, it allows you to change the transparency of the entire image using the opacity parameter.