Open the CSV file with a text editor e.g. Notepad++.
Copy all text
Copy all rows with Ctrl+A.
Switch back to Excel and click in cell A1.
Open the Text import wizard by one of following methods:
Paste method
Paste method
Click on lower part of the Paste button.
Select Use Text Import Wizard in the drop-down menu.
Text to Columns method
Paste into Excel with Ctrl+V.
Select column A.
Text to Columns method
Use function Text to columns on Data ribbon.
The wizard starts.
The first panel
Click Next.
The second panel
Change Delimiters to Comma.
Click Next.
The third panel
Change Column data format to Text and verify that the format is set to Text for the columns that Excel otherwise will change to the wrong data type or data format.
Click Finish.
Save the file in xlsx.
Close the Excel file and open the file again before you share it in order to verify that the data still has the correct format.