ThinApp User’s Guide : Configuring Package Parameters : Configuring Sandbox Storage and Inventory Names : SandboxNetworkDrives

The SandboxNetworkDrives parameter determines whether ThinApp directs write operations to a network drive or to the sandbox, regardless of isolation mode settings.
When you use this parameter to direct write operations to network drives, the result is the same as setting the isolation mode for the drive to Merged mode.
When you want to save space or share files for collaborative work, leave the default setting of the SandboxNetworkDrives parameter to direct write operations to network drives without storing changes in a sandbox.
You can store changes in the sandbox and prevent the user from making changes to network drives.