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Five common ways openpyxl-generated Excel files break for other users

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Developer-generated Excel workbooks can appear error-free locally yet display broken formulas or repair prompts when opened on another user's machine. Key pitfalls include using TEXT() functions whose format codes are language-dependent, leaving unguarded formula rows that show #VALUE! errors before any data is entered, and cross-sheet data validation that triggers content warnings in older Excel versions. Dynamic array functions such as XLOOKUP and FILTER are unsupported or mishandled by Google Sheets, silently corrupting imported data. The author recommends cell-level number formatting, defensive IF guards, named ranges for dropdowns, and opening generated files in real Excel to verify formulas before shipping.

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