Notes about the ZTL file extension:
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries, unused processes and other unfavourable system settings to identify slowdown issues.
The ZTL file type is primarily associated with 'ZBrush' by Pixologic, Inc.. ZBrush is a 2D and 3D image creation and processing tool, powered by a real-time rendering engine. The ZTL file is used for saving tool configurations (geometry, color, texture and materials saved).