A file named is a compressed archive (7-Zip format), and without knowing the specific context of where you found it, it usually suggests a sequel or a secondary part of a collection.
Often used by photographers to batch-send files to a client named Anna. Anna2.7z
A compressed backup of a specific directory from a "Phase 2" version of a program. 3. Multimedia Collections A file named is a compressed archive (7-Zip
If you are into gaming (like Skyrim , Fallout , or The Sims ), "Anna" is a very common name for: or The Sims )