XLSX Conversion Fails: SheetView parameter 'showZeroes' incompatible with openpyxl 3.1.0+

[ByMisterJ]

Description

MarkItDown fails to convert Excel files (.xlsx) with a TypeError related to the showZeroes parameter in openpyxl.

Steps to Reproduce

1. Have Python 3.13+ installed
2. Install markitdown 0.1.6 with openpyxl 3.1.0 or newer
3. Run: markitdown "file.xlsx" > "output.md"
4. Error occurs

Environment

• MarkItDown version: 0.1.6
• Python version: 3.13.3
• openpyxl version: 3.1.2
• OS: Windows 11 (didn't check 10)

Root Cause

openpyxl changed the parameter name from showZeroes to showZeros in version 3.1.0, but MarkItDown 0.1.6 is still using the old parameter name.

Expected Behavior

MarkItDown should successfully convert .xlsx files without errors.