CSV files look garbled or leading zeros are gone! What to do before asking AI, and the correct way to open them

Have you ever opened a CSV exported from a system by double-clicking it, only to find... Japanese text turned into mysterious ...

Does CSV look garbled when opened in Excel? How to fix Japanese text and preserve leading zeros

When I opened a CSV file in Excel, the Japanese text turned into unreadable characters.When product names or names are ...