Ok, now I need to say clearly "TRY THIS AT YOUR OWN RISK" but I'm quite fond of the frosted glass texture which comes with one of the doors.
Thing is, I wanted it in my standard glass texture folder, to save me loading that door every time. So here's the thing, find the frosed_glass.tga and copy it to
C:\Program Files\Antics\Antics3.0\Content\Base\Textures glass\maps
now find the glass_frosted.ksh and copy that to
C:\Program Files\Antics\Antics3.0\Content\Base\Textures glass\shaders
Now save your project and you'll be in biz.
The Frosted glass texture will now appear in the glass textures folder.
This method may not be supported officially, but it works!