If you're looking for the 3D Viewer on your PC, you can easily find it in the Windows 10 operating system. The 3D Viewer is a pre-installed application that allows users to view 3D models and objects. To locate the 3D Viewer on your PC, follow these steps:

1. Click on the Windows icon in the bottom left corner of your screen to open the Start menu.

2. In the search bar, type '3D Viewer' and press Enter.

3. The 3D Viewer application should appear in the search results. Click on it to launch the program.

If you don't see the 3D Viewer in the search results, it's possible that the application is not installed on your PC. In that case, you can download it for free from the Microsoft Store. Simply open the Microsoft Store from the Start menu, search for '3D Viewer,' and follow the on-screen instructions to install it. Once installed, you can access the 3D Viewer from the Start menu or by typing its name in the search bar.

With the 3D Viewer, you can open and view 3D models in various formats, including .fbx, .3mf, and .obj. You can rotate, zoom, and pan around the models to inspect them from different angles. The application also allows you to take measurements and make annotations on the 3D models, making it a useful tool for visualizing and analyzing 3D designs, prototypes, and models.

In addition to viewing local 3D models, the 3D Viewer also supports opening and interacting with 3D models from online sources and cloud storage services. This makes it easy to explore and work with 3D content from a variety of sources. As a built-in application in Windows 10, the 3D Viewer offers a convenient way to view and interact with 3D models without the need for third-party software.

In conclusion, the 3D Viewer is located on your PC running Windows 10 and can be easily accessed through the Start menu or by searching for it. Whether you're a designer, engineer, or 3D enthusiast, the 3D Viewer provides a user-friendly platform for exploring and interacting with 3D models on your PC.