If you're working with 3D models on Windows 10, you may be wondering if you need a 3D viewer for Microsoft. The answer depends on your specific needs and the type of work you're doing with 3D models.

As of Windows 10 Creators Update, Microsoft has integrated a 3D viewer app called 'Mixed Reality Viewer' which allows you to view 3D models, create 3D scenes, and even take mixed reality photos and videos. This app is built-in to Windows 10, so you technically don't need to download a separate 3D viewer.

However, if you're looking for more advanced features or better performance, you may consider using third-party 3D viewer software. There are many 3D viewer applications available for Windows, some of which are optimized for specific use cases such as 3D printing, architectural design, or engineering simulations.

If you're involved in 3D modeling or design work, having a dedicated 3D viewer with advanced features can greatly enhance your productivity and creativity. Some third-party 3D viewers offer capabilities such as measuring distances, analyzing cross-sections, and editing 3D models, which may not be available in the built-in Mixed Reality Viewer.

Additionally, if you're working with 3D printing, a specialized 3D viewer can help you prepare and optimize your 3D models for printing. These tools often include features like automatic mesh repair, support structure generation, and slicing for 3D printers, making the printing process smoother and more reliable.

In conclusion, while Windows 10 provides a built-in 3D viewer app, the need for a dedicated 3D viewer largely depends on the complexity of your 3D modeling tasks and the level of functionality you require. For basic viewing and simple scene creation, the Mixed Reality Viewer may suffice. However, for more advanced capabilities and tailored features, exploring third-party 3D viewer options could be beneficial for your specific use case.