Windows 8 style 3D file icon, example textured as .mp3. I'm not sure if this is robust enough to handle raw extracted .ico to retexture, but the mesh is in the correct shape. I forgot about this when I moved on to use Windows 10 as the base for purpose.
Windows 10 File Icons: https://sketchfab.com/3d-models/windows-10-file-icons-5b4a2b79d91e49b49aadab632c756a13