You can often tell by looking at the “extra field” or “comment” in the ZIP header. Use zipdetails (Perl utility) or open the file in 7-Zip → “Properties.” It may list “Created by: WinRAR 5.70” or similar.
At its core, r10.zip is a —a compressed folder that bundles one or more files into a single, smaller package for easier storage or transfer. The “r10” prefix suggests a version or part number, commonly seen in: r10.zip