This is a split archive . Large files are often broken into smaller parts (part1, part2, etc.) to make them easier to upload, download, or store on systems with file-size limits.
The .rar format is designed to shrink the size of the original data to save storage space. Sudnln02EMNL00WB24WYE45.part3.rar
Files with this specific, complex naming pattern are commonly found in: This is a split archive
The string Sudnln02EMNL... is likely a unique hash or automated naming string used by a database, content delivery network, or specific software tool to track a large data export or system backup. Purpose and Function content delivery network
Rar archives use error-correcting codes to ensure that when parts are combined, the original file is reconstructed perfectly.
Large-scale research data split for distribution.