Zend certified PHP/Magento developer

Magento 2 Delete download file from downloadable product via csv

I want to update my downloadable product via csv by removing current assign downloadable file and assign new file to the product as shown in screenshot I want to delete this test_image2.zip file and assign new file to it.

enter image description here

I have 117k product catalog and I want to update all my products.

I’m using this csv in following format:

enter image description here

This csv add new entry in product, as showing in following screenshot

enter image description here

Anyone can help will be highly appreciable. Thanks in advance.