Excel Export — Fixed Garbled Characters with a UTF-8 BOM

We've fixed the garbled characters in Excel downloads issue that some users reported.

Cause

The downloaded .csv file was missing a BOM (Byte Order Mark), so MS Excel interpreted it as ANSI (CP949), which garbled UTF-8 multibyte characters.

Fix

• Automatically prepend the 0xEF 0xBB 0xBF BOM header to CSV output
• New .xlsx format support — column widths and header styles applied automatically
• Choose between CSV and XLSX in the download options

For older CSV files, re-saving them in Notepad with "Save As → Encoding: UTF-8" will display them correctly.

Thanks to everyone who reported this. Column selection is coming next week as well.