Unity3d File Viewer -

Navigate to the game’s installation folder. Look for *_Data folder. Inside, you will find resources.assets , sharedassets0.assets , or .bundle files.

This is an online web-based tool. You drag your .unity3d file into a browser window, and it renders the assets via WebGL. unity3d file viewer

Click on a Mesh item. The 3D viewport will display the wireframe. Click on a Texture2D to see the albedo map. Navigate to the game’s installation folder