your_spreadsheet.xlsx (actually a ZIP) │ ├─ [Content_Types].xml ├─ _rels/ ├─ docProps/ │ ├─ app.xml │ └─ core.xml │ └─ xl/ ├─ workbook.xml → overall workbook structure ├─ worksheets/ → each sheet as XML │ ├─ sheet1.xml │ ├─ sheet2.xml │ └─ ... ├─ sharedStrings.xml → all text strings ├─ styles.xml → cell styles ├─ drawings/ → images, charts ├─ media/ → inserted images └─ _rels/
MS Excel Usages

Seong-lae Cho
