So you've got some awesome OBJ files that you want to open in Blender on your Windows 10 machine? No worries, it's super simple to do! Here's a step-by-step guide to get you on your way to 3D modeling greatness. First, make sure you have Blender installed on your Windows 10 computer. If you don't have it yet, head over to the Blender website and download the latest version for free. Once you have Blender installed, locate the OBJ file you want to open. Simply right-click on the OBJ file and select 'Open with' from the menu. Then, choose 'Blender' from the list of programs. If Blender isn't listed, click on 'Choose another app' and navigate to the Blender executable file. After selecting Blender, make sure to check the box that says 'Always use this app to open .obj files' so that all OBJ files will open in Blender from now on. Click 'OK' and watch as your OBJ file magically opens in Blender! Now you can start editing, animating, and creating 3D masterpieces to your heart's content. With these simple steps, you can easily open and work with OBJ files in Blender on your Windows 10 computer. Happy modeling!