I’m pretty sure that it is Excel, or whatever tool you are using to open the file that is stripping out the leading zeros. You can test this by openining your downloaded file in a text editor and validating whether the leading zeros are there. You can configure how Excel does the data import from the CSV. See this document: http://superuser.com/questions/431637/why-is-excel-removing-leading-leading-zeros-when-displaying-cs…
