What is the of the file (e.g., is it a game, a document, software, or media)?

Changing the file names can cause extraction errors. Security Warning

When large files are broken down into smaller, manageable chunks for easier uploading or downloading, they are named sequentially (e.g., .part1.rar , .part2.rar , etc.). How to Handle Them:

"YUMYUM.part1.rar" appears to be the first part of a multipart RAR archive file, typically used for compression and sharing large amounts of data.

RAR (Roshal Archive) is a proprietary file format that supports data compression, error recovery, and file spanning.

You must have all parts of the archive (part 1, part 2, etc.) in the same folder.