: Often a unique identifier, such as a SKU, project code, or catalog number used by specific databases or release groups.

: This indicates the file was compressed using 7-Zip , a high-ratio archive format.

: This is a split archive part . Large files are often broken into smaller chunks (e.g., .001, .002, .003) to make them easier to upload, download, or store on systems with file size limits. How to Open and Extract the File