I've searched in vain, and I'm not sure how to do this. I'd like to work thru a folder (with subfolders), find all the *.zip files (all multipart), and unzip to a similar folder on another volume ...

While Windows does have some built-in support for file compression, it's pretty limited, and definitely not enough even for a slightly more advanced user. You don't have to be doing rocket surgery or ...

We show you how to create a ZIP file using a Batch file. You can make use of the command-line interface 7-Zip software in Windows 11/10.