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feat: add XLSM (Excel Macro-Enabled Workbook) parsing support #4227

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longway-code wants to merge 1 commit into Unstructured-IO:main from longway-code:feat/add-xlsm-parsing

longway-code commented Feb 8, 2026

Closes 4047

XLSM files have the same structure as XLSX but can contain VBA macros.
This implementation safely extracts only data content, macros are ignored.

Add FileType.XLSM enum with correct MIME type
Update ZipFileDetector to distinguish XLSX from XLSM by extension
Add partition_xlsm() function that wraps partition_xlsx()
Add test suite with 17 tests
Create 5 XLSM test files for different scenarios
Maintain full backward compatibility with XLSX


          feat: add XLSM (Excel Macro-Enabled Workbook) parsing support

486a913

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