Hi I am looking at MicroSqueak and trying to make it work in a new image. I run MicroSqueak in a new VM and it works. What is a bit odd is that MicroSqueak has a different class hierarchy for String. It doesn't know about ByteString nor WideString and the String class in MicroSqueak has a different format than the one in recent images. How is it possible that a MicroSqueak generated image runs on the recent VMs? The special objects array that MicroSqueak creates is different. For example, at index 7 MicroSqueak put its own version of String instead of ByteString. I have tried it on Mac OS X on the Squeak 4.2.5b1 VM and on Windows on the 4.0.2 VM. My guess is that it works because MicroSqueak String has the same structure as ByteString in current images. So the VM does not notice that it is working with a different object. Thanks Gabriel