Excell or OpenOffice should work.
Ill try a test myself and get back to you.
First one warnning. Here is a Quote from the 2da file format.
Columns
Applications may reference a column by position (column 0, column 1, etc.) or by name. To avoid
breaking code that depends on column position, the following rules apply:
· Always add new columns after the very last column.
· Never insert a new column inbetween two existing ones or as the first one.
· Never delete a column from a 2da.
· Never rename a column.
· When adding a column, make sure that all rows include entries for the new column.
So do not be supprised if reording OC column's in the 2DA's starts breaking things.