Just noticed another weird thing.
I installed SkinStudio 7 Pro (which uninstall all previous SkinStudio versions). Since that "Edit in SkinStudio" in WindowBlind's GUI doesn't work anymore
(XP SP3)
EDIT (2 hours later): TIP for those who might be concerned
- Open Registry
1°) search for all values C:\Program Files\Stardock\Object Desktop\SkinStudio\SknStdio.exe and replace them by C:\Program Files\Stardock\Object Desktop\SkinStudio7\SkinStudio.exe (pay attention to respect the "....." )
2°) search for all SkinStudio keys and verify path is C:\Program Files\Stardock\Object Desktop\SkinStudio7\SkinStudio.exe
N.B about 50 modifications for me 