Pass command line arguments to application?

Salut!

I cannot figure out how to pass command line arguments to Blender.exe
Is it possible?

Finally, I've figured out how to open FBX* file in Blender*
(Blender is 3d graphics editor. FBX is non-native format, that must be imported, instead of opening).

The command line is:

blender.exe -P im_fbx.py -- MyModel.fbx

(while im_fbx.py reads:
import sys
import bpy
argv = sys.argv
argv = argv[argv.index("--") + 1:] # get all args after "--"
bpy.ops.import_scene.fbx(filepath=argv[0])
)

So, my question is:

How can I pass all these parameters to BlenderPortable.exe?

BlenderPortable.exe -P im_fbx.py -- MyModel.fbx
just does not work. Blenders starts shiny empty scene.

Thank you!
P.S. Yes, I have read https://portableapps.com/node/19115