MS Office EXCEL 2010 the safest way to open .csv file and maintain leading zeros

Step 1:
Open EXCEL, click on tab "Data", select "From Text".

Step 2:
Browse to your local file folder and open the .csv file.

Step 3:
In the "Text Import Wizard - Step 1 of  3" popup, select "Delimited" and click on "Next".

Step 4:
In the "Text Import Wizard - Step 2 of  3" popup, select "Comma", un-select all other options, and click on "Next".

Step 5:
In the "Text Import Wizard - Step 3 of  3" popup, in "Data Preview" click to select the column you want to maintain leading zeros, then select "Text" in "Column data Format", now click on "Finish".

Step 6:
In the "Import Data" popup click on "OK".

Now you can see all leading zeros in EXCEL!