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Merge pull request #436 from LloydNicholson/feat/open-encrypted

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Open password-encrypted workbooks (Agile and Standard encryption) (#11)

# Conflicts:
#	ROADMAP.md
#	docs/file-format-parity.md
#	docs/gaps.md
#	docs/target-app-parity.md
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Brandon Thomas
2026-10-11 18:06:04 -04:00
parent 0a54876e2c 83d6a6fbe7
commit a34fe4a7af
24 changed files with 1437 additions and 47 deletions
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docs/gaps.md
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@@ -66,14 +66,16 @@ No alpha blockers: every core workflow passes the [alpha gate](roadmap.md#alpha-
- **Impact:** wrong numbers are worse than missing features.
- **Estimate:** 10–15 h. [function-parity.md](function-parity.md#formula-language)
### 7. Legacy `.xls` only partly read; no password-protected workbooks (FF)
### 7. Legacy `.xls` only partly read; encrypted workbooks can't be saved with a password (FF)
- **Evidence:** #121: Excel 97-2003 (BIFF8) `.xls` files now open (values, formulas, number
formats, merges, sizes, names); fonts, fills, borders, charts, pictures, comments, conditional
formats, validation and BIFF5 files are not read, and `.xls` is never written. Encrypted
workbooks (OOXML and `.xls`) are recognised and refused with a clear message since #17 (closed #11).
formats, validation and BIFF5 files are not read, and `.xls` is never written. Password-encrypted
`.xlsx` workbooks (Agile and Standard encryption) open with their password since #11, but are
saved without it: GridCraft can't write an encrypted file yet. Encrypted `.xls` (FILEPASS) and
RC4-encrypted files are still refused with a message.
- **Impact:** common in finance, government and anything older than 2007; encrypted files are
routine in business.
- **Estimate:** 18–27 h (`.xls` styles and objects 10–15, encryption 8–12). [file-format-parity.md](file-format-parity.md)
- **Estimate:** 14–21 h (`.xls` styles and objects 10–15, encryption 4–6). [file-format-parity.md](file-format-parity.md)
### 8. PivotTables: no slicers, calculated items, PivotCharts; unverified in Excel (F)
- **Evidence:** `parity-checklist.md` missing `insert.slicer`, `insert.timeline`,
@@ -161,6 +163,7 @@ No alpha blockers: every core workflow passes the [alpha gate](roadmap.md#alpha-
| 2026-10-11 | minor | §6: iterative calculation for circular references landed (Maximum Iterations, Maximum Change) |
| 2026-10-11 | minor | §15: trim-reference operators (`A1:.E10`, `A1.:E10`, `A1.:.E10`) parse and evaluate |
| 2026-10-11 | minor | §4: trendlines (six types, forecast, equation and R²) read, written and drawn |
| 2026-10-11 | minor | §7: password-encrypted workbooks open with their password; saving with one remains (#11) |
| 2026-10-11 | minor | §16: comment navigation, Show Comments, Show All Notes and Convert to Comments landed (#281) |
| 2026-10-11 | minor | §7: `.xls` (BIFF8) import of values, formulas and number formats (#121) |
| 2026-10-11 | minor | §3: XLSX pass-through keeps custom XML, external links, connections, query tables, printer settings, controls and OLE objects (#330, #324) |