How to Keep OneDrive Files in CSV Format Instead of Excel Workbook Format

OneDrive stores the file it receives; it does not normally rewrite a CSV into an XLS or XLSX file merely because it is synced. The apparent conversion usually comes from hidden filename extensions, a spreadsheet application association, or choosing an Excel workbook format when saving after the file opens.

Distinguish the File Icon from the Actual Extension

A CSV often displays an Excel icon because Excel is the default app for .csv. That does not make it an Excel workbook. In Windows File Explorer, turn on View > Show > File name extensions and check whether the full name ends in .csv, .xls, or .xlsx.

Download and Preserve the Original CSV

1. In OneDrive on the web, select the file and choose Download rather than opening and resaving it immediately.
2. Check the downloaded filename extension. If it remains .csv, OneDrive stored the correct format.
3. Open the file from Excel with Data > From Text/CSV when delimiter, date, or leading-zero handling matters.
4. After editing, choose File > Save As and select CSV UTF-8 (Comma delimited) (*.csv). Accept the warning that CSV stores only one sheet and plain values.

Check the Uploading Computer

If the OneDrive copy truly ends in .xlsx, inspect the computer that creates or uploads the bank export. The user may be opening the CSV and saving it with Excel’s default workbook type before synchronization finishes. Compare the local synced folder and OneDrive web filenames.

Verify the File as Plain Text

Open a downloaded copy in Notepad or another text editor. A CSV should contain delimited text rather than an Excel workbook package. Re-upload the verified .csv file and confirm that its extension remains visible in OneDrive.

Open and Save CSV Files with WPS Spreadsheets

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WPS Office can perform this local workflow directly. WPS Spreadsheets opens common CSV and XLSX files and lets you keep CSV as the output type.

1. Download a local copy from OneDrive and open it in WPS Spreadsheets.
2. Choose the correct comma delimiter and character encoding during import.
3. Edit plain values without adding extra sheets or workbook-only features.
4. Use Save As, choose CSV, confirm the extension, and reopen the result to verify its columns.

WPS AI can assist with data summaries and formula explanations, but CSV itself stores plain tabular values rather than formulas, formatting, or multiple worksheets.

Keep OneDrive Files in CSV Format Instead of Excel Workbook Format FAQs

Why does a CSV file show an Excel icon?

Windows associates CSV files with Excel by default. The icon identifies the opening app, not the stored file format.

Can CSV preserve formulas and multiple worksheets?

No. CSV stores plain text values for one table. Use XLSX if formulas, formatting, charts, or multiple sheets must be retained.

Why do leading zeros disappear after opening the CSV?

Spreadsheet apps may interpret values as numbers. Import through Data > From Text/CSV and set the affected columns to Text.

How can I prove OneDrive did not convert the file?

Download it without editing, show the full extension, and open a copy in a text editor. If it is delimited text ending in .csv, the stored file was not converted.