JT Assistant is a viewer for 3D file format, supporting both native and imported models. JT Assistant is optimized for Android and can be used as an offline viewer.

In addition to viewing 3D models, JT Assistant can import models from a number of CAD and mesh formats. It is optimized for Android, and has been tested on a range of modern devices.

In order to open the files, you need to install the latest version of JT Assistant. If you don't have it yet, you can download it from Google Play.

There is a menu on the left side of the screen, which allows you to change the view of the model. You can also change the standard views, which allow you to see the model in a particular way.

In order to open a file, you need to choose the file in the list on the left side of the screen. The model will be displayed in the view you have chosen.