Are there any open source app virtualization solutions for Windows [closed]

I am looking for open source solutions that provide application virtualization for Windows! In other words an open source to ThinApp from VMWare.

I have found several commercial options, but nothing open source:

http://www.microsoft.com/systemcenter/appv/dynamic.mspx

http://www.vmware.com/products/thinapp/overview.html


Cameyo offers free Application Virtualization and works very well. VirtualBox is typically used for OS virtualization.


After some searching I was able to find one open source project: http://code.google.com/p/appstract/

Haven't tested it, but is open source.