'What is the platform tag to download packages for windows x86 64 using pip?

I need to download a package to my Mac to transfer and install it on an offline PC.

I am trying to do:

pip download --only-binary=:all: --python-version 39 --abi cp39 --platform winx86-64 opencv-python numpy matplotlib

But that's obviously the wrong platform tag. How do I find out which one to take??

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