By the way.....
im using filemaker 10 on a mac,-
and i´m a bit new to this program....
Assuming your own file uses comma as the decimal separator, you could set the target field to auto-enter a calculated value (replacing existing data) =
Substitute ( Self ; "." ; "," )
Make sure to perform auto-enter options while importing.
What happens if the number is in the thousands? I.E. 2,999.99. Will the results look like 2,999,99?