A real workbook, not a text file wearing a spreadsheet costume
CSV is a transport format. It carries values and nothing else: no column widths, no data types, no formatting, no second sheet. Every application that opens one has to guess what the values mean, and those guesses are where the damage happens.
Converting to XLSX makes the structure explicit before anyone opens it. Fields land in their own cells, the delimiter is detected rather than assumed, and the text is read as UTF-8 so accented and non-Latin characters survive. The file you share behaves the same on the next machine.
Common uses
- Database exports handed to colleagues who work in Excel.
- Analytics downloads that arrive as CSV and need formatting.
- Bank and payment exports prepared for bookkeeping.
- Contact and product lists tidied before a bulk import.
Going the other way, Excel to CSV produces the plain export that import tools expect. If the data is trapped in a PDF instead, PDF to Excel rebuilds the tables, and Bank Statement to CSV uses AI when the layout is not a clean table at all.