Is SDK 1.2.3 compatible with Ext 4.1 beta 2? I am trying to use the image slicer but it just hangs - no cpu or change in memory.

My command...
Code:
sencha.bat slice theme -d extjs -c extjs\portal\resources\css\theme.css -o extjs\ext\resources\themes\images\custom -v
I work in a Windows shop and so SDK 2 is not an option. When will SDK 2 be ported to Windows?

Sass 3.1.15
Compass 0.11.7