I can explain how to handle multi-part archives or identify the content of that specific 2008 release.

Based on the naming conventions of the scene group (a group that historically releases game, software, or media content), here is what this text indicates:

This indicates that the file is the first part of a split RAR archive [1]. These archives require all parts (e.g., part2, part3, etc.) to be downloaded into the same folder to be extracted.