Have you recently noticed an unfamiliar program called 3D Viewer on your computer? This software allows users to view 3D models in various file formats, such as .fbx, .obj, .3mf, and more. If you're wondering how it ended up on your system, there are several possibilities to consider.

First, 3D Viewer may have been pre-installed by the manufacturer of your computer. Some computer brands include a selection of built-in programs and applications, and 3D Viewer could be one of them. Check your list of pre-installed software to see if it's included.

Another way 3D Viewer could have been installed is through a software update. If you've recently updated your operating system or any software related to 3D modeling, the installation of 3D Viewer may have been included in the update package. This is a common practice for certain software to ensure that users have the latest tools and features available.

Additionally, 3D Viewer could have been inadvertently installed alongside another program you recently downloaded. Sometimes, when you install new software, additional applications are included as part of the installation process. These additional programs are often optional, but they may be automatically selected unless you specifically choose to opt out of them during the installation.

If you find 3D Viewer on your computer and you're unsure about its origins, it's important to verify its legitimacy. While 3D Viewer itself is a legitimate program developed by Microsoft and is commonly used for viewing 3D models, it's always a good idea to confirm that the version on your system is authentic. Malware and other unwanted software may sometimes disguise themselves as legitimate programs, so running a reputable antivirus scan can help ensure that your system remains secure.

If you have no use for 3D Viewer and would like to remove it from your computer, you can uninstall it through the Control Panel on Windows or by using the Finder on macOS. Simply locate the program in the list of installed software, select it, and follow the prompts to remove it from your system.

In conclusion, there are several potential ways that 3D Viewer may have been installed on your computer, from pre-installation by the manufacturer to inclusion in a software update or as part of another program's installation. Regardless of how it got there, it's essential to verify its legitimacy and take appropriate action if necessary to ensure the security and performance of your computer.