Create, edit, inspect, analyze, recalculate, render, and validate standalone spreadsheet files in .xlsx, .xls, .csv, and .tsv formats. Use whenever the requested input or deliverable is a workspace spreadsheet, including formula-driven workbooks, native charts, formatted tables, data cleanup, workbook questions, legacy XLS conversion, Chinese or bilingual workbooks, and visual spreadsheet QA. Do not use for Google Sheets, macro-enabled .xlsm files, or live control of Microsoft Excel.