import c4d

def main():
    importPlugins = c4d.plugins.FilterPluginList(c4d.PLUGINTYPE_SCENELOADER, True)
    for p in importPlugins:
        print('{} : {}'.format(p.GetName(), p.GetID()))

if __name__=='__main__':
    main()

If it runs within Cinema 4D it returns this list:

3D Studio (*.3ds) : 1001037
Alembic (*.abc) : 1028081
BVH (*.bvh) : 1001048
CATIA (*.CATPart *.CATProduct *.cgr) : 1039778
Cinema 4D (*.c4d) : 1001025
COLLADA 1.4 (*.dae) : 1022315
COLLADA 1.5 (*.dae) : 1025754
DEM (*.dem) : 1001046
DWG (*.dwg) : 1021372
DXF (*.dxf) : 1001035
FBX (*.fbx) : 1026369
IGES (*.igs *.iges) : 1039779
Illustrator (*.ai) : 1001045
JT (*.jt) : 1039780
Lightwave (*.lws) : 1001043
Lightwave Object (*.lwo) : 1001044
MeshObject JSON Asset : 1040819
SKP (*.skp) : 1033845
Solidworks (*.SLDPrt *.SLDAsm *.SLDDrw) : 1039781
STEP (*.stp *.step *.p21) : 1039777
STL (*.stl) : 1001020
Updater loader : 450000233
Volume (*.vdb) : 1039864
VRML 2 (*.wrl) : 1001033
Wavefront OBJ (*.obj) : 1030177

However when it runs via console

c4dpy *pathToScript*

it logged this one

3D Studio (*.3ds) : 1001037
Alembic (*.abc) : 1028081
BVH (*.bvh) : 1001048
CATIA (*.CATPart *.CATProduct *.cgr) : 1039778
Cinema 4D (*.c4d) : 1001025
DEM (*.dem) : 1001046
DXF (*.dxf) : 1001035
IGES (*.igs *.iges) : 1039779
Illustrator (*.ai) : 1001045
JT (*.jt) : 1039780
Lightwave (*.lws) : 1001043
Lightwave Object (*.lwo) : 1001044
MeshObject JSON Asset : 1040819
SKP (*.skp) : 1033845
Solidworks (*.SLDPrt *.SLDAsm *.SLDDrw) : 1039781
STEP (*.stp *.step *.p21) : 1039777
STL (*.stl) : 1001020
Updater loader : 450000233
Volume (*.vdb) : 1039864
VRML 2 (*.wrl) : 1001033
Wavefront OBJ (*.obj) : 1030177

It's a little bit shorter. And there is no FBX
Is it bug? May be I do something wrong?

I use Cinema 4D R20.030 on Windows.

P.S. I'm sorry for any grammar mistakes.
P.P.S. C4D developers! You're awesome! C4D is just amazing! I really love it!