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LibreOffice Portable is the most trusted: it opens/saves .xlsx files, supports most Excel 2013 formulas, and has no registry writes. Don’t trust “MS Excel 2013 Portable” downloads. They are almost always pirated, unstable, or malicious. If you truly need Excel 2013 on a USB drive without installing, your only safe option is to use a legitimate virtualized environment (like Windows To Go with a licensed Office 2013 installed) — but that’s heavy and not truly portable in the “run from any USB” sense.
I appreciate you asking for a “proper story” — it sounds like you want a factual, investigative look into “MS Excel 2013 Portable,” not just a quick definition.
If you share why you need Excel 2013 specifically (vs newer Excel or free alternatives), I can suggest a safer, workable path.
| Solution | Works Offline? | Portable? | Free? | |----------|----------------|-----------|-------| | (Microsoft 365 free tier) | No (requires internet) | Yes (browser) | Yes | | LibreOffice Portable (Calc) | Yes | Yes (PortableApps.com version) | Yes (open source) | | Google Sheets offline mode | Partial (needs prior sync) | Yes (browser+extension) | Free with Google account | | WPS Office Portable (older free version) | Yes | Yes (unofficial repack) | Freemium |