I read a lot of forum threads about this some time ago and it did seem that you can't change the position by editing the def file - it would be very nice if you could! You could always add a new column where you want it and copy all the info from the old column into it using something like

UPDATE Links SET New_Column_Name = Old_Column_Name

in the SQL Monitor. My SQL knowledge isn't very good so someone may need to correct this. Also, you won't be able to give it exactly the same name as the existing column using this method.

Laura.
The UK High Street