: If you need to turn a standard spreadsheet into a ZIP format for transfer, you can use built-in Windows "Send to" tools or Online-Convert .
: If you rename an .xlsx file to .zip , you can see its internal folders, such as xl/worksheets (where the actual data lives) and _rels (the "relationship" files that map how pieces connect). XXEl.laXX.zip
: Developers often "zip" or "unzip" these files to manually edit XML data or troubleshoot corruption. 2. Capture The Flag (CTF) or Malware Analysis : If you need to turn a standard