This file contains RTW files, at the Patch 1.5 level.
Use overwrite, to replace any existing files.
Extract this to the RTW install directory, e.g.,
C:\Games\Rome Total War\
This file does NOT contain any other modded elements, like graphics or fancy descriptions (you can create & add these yourself, if you want). Backups of each original and the corresponding modded file are provided, in addition to the 2 modded files themselves.
No bugs whatsoever, no crashes, worked perfectly fine :)
I actually just installed this on my Mac RTW Version 1.3 because there isn't a 1.5 Patch for Mac yet. No problems. Just remember to rename the modded file to the original name after you've put it in the correct place, for those with problems.
I was originally searching for the original descr_strat file to download after messing up my descr_strat file while trying to unlock unplayable factions, then I found this (YIPPEE!) and that helped me with the unplayable factions too. Thumbs up!