Uh, not sure what you said but this is what I do to make it work -
- run it.
- open up the data (descr_export_unit) at C:\\ Program Files\The creative Assembly\Rome - Total War\Data
- open up unit models (same thing as export_unit)
Then your done. Edit it however and to save -
click save data
click save and save this as descr_export_unit