The n modifier after the tilde forces the index variable to expand only to the

filename and extension.

Explanation:

Suppose we have %~nxa, where we have two modifiers n and x, and a single variable a.

So, the n modifier after the tilde forces the index variable to expand only to the  filename(by the n modifier) and the extension(by the x modifier).

It produces the filename and extension instead of the full path.

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