The file extension refers to a compressed archive created with 7-Zip . Based on your query, "05-08.7z" most likely refers to one of two specific technical packages: Shogi AI: Tanuki "Háo" Evaluation Function

Users typically extract the contents into an eval folder within their Shogi engine directory to improve the AI's "thinking" strength.

やねうら王のビルド手順 · yaneurao/YaneuraOu Wiki - GitHub

05-08.7z ★ Bonus Inside

The file extension refers to a compressed archive created with 7-Zip . Based on your query, "05-08.7z" most likely refers to one of two specific technical packages: Shogi AI: Tanuki "Háo" Evaluation Function

Users typically extract the contents into an eval folder within their Shogi engine directory to improve the AI's "thinking" strength. 05-08.7z

やねうら王のビルド手順 · yaneurao/YaneuraOu Wiki - GitHub The file extension refers to a compressed archive