ThinApp User’s Guide : Capturing Applications : Capturing Applications with the Setup Capture Wizard : Storing Application Changes in the Sandbox

Storing Application Changes in the Sandbox
The sandbox is the directory where all changes that the captured application makes are stored. The sandbox is runtime modification storage and is not a cache. The next time you open the application, those changes are incorporated from the sandbox.
When you delete the sandbox directory, the application reverts to its captured state. You might delete a sandbox when an application has a problem and you want to revert the application back to the working original state.