The bc_mirror_enterpriseb.zip file you have requested: Ship Textures / ISS Enterprise-B Terran Empire (retexture) - 6.5mb 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:
Here is the Mirror Universe version of the USS Enterprise B, these are only a retexture for the C2 Lakota. This ship will add terran empire logos to the hull and will change the ships registry to ISS Enterprise, NCC 1701 - B. The warp engines are now red instead of blue to make it look more evil, just as it should for the Terran Empire.