ThinApp User’s Guide : Configuring Package Parameters : Configuring the ThinApp Runtime : Wow64

Wow64
The Wow64 parameter simulates a 32-bit environment for 32-bit applications that cannot run on a 64-bit Windows operating system.
If a 32-bit application tries to handle its own 64-bit registry redirection, you can activate this parameter before building a project. ThinApp comments out the initial setting to prevent Windows on Windows 64-bit (WOW64) emulation.
Examples
You can uncomment the Wow64 parameter to simulate a 32-bit environment for 32-bit applications on a 64-bit operating system. For example, a virtualized 32-bit Oracle application might not work on a 64-bit operating system.
[BuildOptions]
Wow64=0