db_tsv-Clean suggests this is a "clean" (pre-processed) database export, commonly used for data analysis, machine learning training, or data curation tasks.
Right-click the file and select "Extract All" (if you have Windows 11 or a 7-Zip handler) or "Open with 7-Zip" > "Extract here".
.7z (7-Zip) — A high-compression archive format requiring software like 7-Zip or WinZip to open.