: This indicates it is the first piece of a "multi-part" archive. To extract the "story" or data inside, you would need all subsequent parts (part2, part3, etc.) in the same folder. Common Contexts for this File Type:
: This likely refers to a version number (v1.46) or a specific build ID. sc24265-ETSv146213s.part1.rar
Based on the filename , this appears to be a compressed archive part related to a specific digital release or project. : This indicates it is the first piece