The sovereign_retexture.rar file you have requested: Ship Textures / Federation / Soverign retexture - 1.69mb is not available. Perhaps try browsing all files for the game Star Trek: Bridge Commander and upload any files you want to share or are missing. This is the only information we could locate:
This retexture of the sov gives it a darker, more militaristic style. Appears to be P81's textures, meaning it will work on all such sovs, however you may need to check the names of the old textures to make sure they match and if not rename some files. It also seems to increase the detailing on the ship as well.