--python-exit-code isn't really working when executing scripts via command line

This is what I’m trying:

"C:\Program Files\Blender Foundation\Blender\blender.exe" -b --python-exit-code 100 -P D:\Work\Apache24	emp\scr715F.py

And this is what I get:

read blend: C:\Users\Deniska\--python-exit-codeWarning: Unable to open 'C:\Users\Deniska\--python-exit-code': No such file or directory

It seems to work when no background switch is used.

I’ve also tried those 3 switches in every possible order, doesn’t seem to work at all.

What am I missing?