Likely a project code, version number, or catalog ID.
#026-1 (Part 2 of [Total Number]) Status: Compressed Data Fragment Option 3: User Instructions #026-1.7z.002
#026-1.7z.002 Type: 7-Zip Compressed Split Volume (Part 2) Description: This is the second segment of the multi-part archive for Project #026-1. All parts (e.g., .001, .002, etc.) must be in the same folder to extract the contents. Option 2: Brief Label Likely a project code, version number, or catalog ID