Create new workbook Data > From Text > Select your CSV file In the popup, choose "Delimited" radio button, then click "Next >" Delimiters checkboxes: tick only "Comma" and uncheck the other options, then click "Next >" In the "Data preview", scroll to the far right, then hold shift and click on the last column (this will select all columns). Now in the "Column data format" select the radio button "Text", then click "Finish".
Create new workbook Data > From Text/CSV > Select your CSV file Data type detection > do not detect Note: Excel office365 (web version), as I'm writing this, you will not be able to do that.