mirror of
https://github.com/storytold/gridcraft.git
synced 2026-10-25 11:16:49 -06:00
vangel76andClaude Opus 5.5
bd5c5c1d26
Clean-room import of Excel 97-2003 workbooks from the public [MS-CFB] and [MS-XLS] specifications: compound-file streams (FAT, mini FAT, directory tree), the BIFF8 Workbook stream with Continue records, shared strings, all cell records, formulas decoded from Ptg tokens (shared and array formulas, 3-D refs, names, add-in/newer functions by name) with cached results, number formats, the 1904 date system, merges, column widths, row heights, defined names and print areas/titles. Encrypted (FILEPASS) and BIFF5 files are refused with a clear message; everything else is skipped with a warning. .xls opens as a new unsaved workbook (Save As .xlsx). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>