First-time use: attempting to reassemble piece files using GUnite

I now have 3 piece files, and when I attempt to reassemble them using GUnite I get the message:

This piece file does not contain the GSplit tags required by GUnite. It cannot be united automatically.
Please select another piece file.

I (now) see that the “Do not add GSplit tags to piece files” checkbox was checked (unfortunately), and cannot be modified, for some unknown reason.

Can I specify the tag parameters manually to restore my single (large) file from the 3 pieces? And how, and what, etc.

Thanks in advance for any help you may be able to provide.

In your case, you can merge all piece files together and you’ll get your original file back.

Use copy /b for instance