Many "Packs" with these naming styles originate from community-specific boards.

There is no public information or specific "complete post" matching the filename currently indexed.

Do you remember the where you first encountered this file?

If you have the or the exact site name where you saw this file mentioned, I can try to help you narrow down the source.

Many niche data collections are shared via private links in these apps.

Search for the filename on an NZB indexer, as these files are often split to bypass size limits.