You should be able to delete the Thumbs.db file in WinRAR from that zip archive you have created.
To see that Thumbs.db file in File Explorer,
At the top of Explorer, click the 3 dots and select Options, then on the resulting dialog, click the View tab on the resulting dialog.
Scroll down the list and temporarily uncheck the option to 'Hide Protected Operating System Files'
You will then find that hidden file in that folder.
Be sure to hide operating system files again.