The theme modified from the aero.msstyles 26100.1 file works very well
The same modification in the aero.msstyles 26100.1301 file gives the error of the 1st post (and as indicated in the 1st post)


That's why I ask if someone was able to modify and make a theme work from the 26100.1301 file, for those who use 24h2


It seems that WSB does not work with this new msstyles version (like the test under 24h2)