Sandbox - Privacy
Manage these settings at: Menu ▸ Settings (gear icon) ▸ Tools ▸ Sandbox ▸ Customize ▸ Privacy
A potentially harmful application can try to access data when opened as a virtualized application.
You can limit or completely block all access to your files so that they are invisible to a virtualized application. This prevents any malware from accessing your files and sending them to somebody via the Internet.
By default, files located in the System, Internet Explorer and Application Data directories are automatically blocked.
Unblock access to any files by changing the status to Allow. You can also add your own folders and set the same block/allow access for them.