CMD Batch rename. Read new names from text file

I have a directory of product images that I'd like to rename to the products's UPC. I have the file name mapping in a spreadsheet, so I can export it to CSV or tab delimited.

Given filenames.txt:

CurrentName     NewName
DSCN4033.png    750732000259.png
DSCN4023.png    750732000013.png
DSCN4024.png    750732000020.png
DSCN4022.png    750732000099.png

DSCN4033.png would become 750732000259.png

If I were doing this with Bash, the command would be

while read old new; do mv "$old" "$new"; done < filenames.txt

This is for a project at work that must be done with a Windows batch file so that my successors don't have to mess with Cygwin.

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