This specific 3D model, "Carved Picture Frame 3D model 32", is an asset made available by "Unknown author".
You can download this asset for free at "Unknown platform" by following the link.
Usage of this 3d asset is subject to the "Unknown license" agreement.
STL (Stereolithography, filesize: 114 MB), OBJ (OBJ, filesize: 203 MB), FBX (Autodesk FBX, filesize: 69 MB), MAX (Autodesk 3ds Max, filesize: 188 MB), MA (Autodesk Maya, filesize: 178 MB)