A customer provides some information to our app in CSV files which they prepare using Excel. One of the columns has a key value which is a 6 char string. Some clients have defined keys with all digits such as "000102". If they format the column in Excel as text the file is saved with the full key, but if they happen to open the file again with Excel the value is interpreted as numeric and the leading zeros are lost.

Is there any solution to this?

TIA,

Alex