Powershell formatting in an culture independent way?! for numbers

When I use formatting for numbers bigger than 1000 like this :

"{0:F2}" -f 1000

I get this 1000.00 result for a US system language

and I get this 1000,00 result for a DE (german) system language.

Now I want to avoid that , without using replace ",","." or something.

So how to get a culture independent formatting?