WP-34s: how to create/edit skins?

[pascal_meheut]

There are 2 formats: one for the old Windows-only emulator, .skin and one for the Qt emulator, .xskin.
They are basically the same as the 2nd one is based on the 1st but based on XML and slightly richer to support the use of real fonts instead of bitmap display and other enhancements.

As far as I know, there is no documentation nor tool. The file is not that complicated: it contains the name of the image file to display as a backgound, a description of various sizes and the positions and shortcuts of the keys mainly.
But the big part is the "painters" describing how to display the content of the screen in bitmap mode and changing it is a huge work.

I built a small application to generate skins with the same layout but different sizes but only for the iOS version which uses a slightly different format (and it is not public) but that's all. So no easy solution.