Try winrar, or update winzip, or redownload archiveThanks for the response.
New PC and fresh install, extracted with winzip. But looks like all files intact.
Saved to path:
C:\Program Files (x86)\Steam\steamapps\common\Sid Meier's Civilization IV Beyond the Sword\Beyond the Sword\Mods\Caveman2Cosmos then /assets/xml
Each xml fails to load, a popup occurs and I have to click ok for hundreds of them. I tried writing over the initial one that loaded with the original xml and it worked, then went on to the next and failed. So path looks good, just a problem with the xml loading.
It seems like somehow your download got corrupted