Notes about the CIV file extension:
To open this file type, a required software must be installed. Without it you only see a Windows message "The following file cannot be opened
" (Windows 7) or "How do you want to open this file?
" (Windows 10) if you double-click the file. There click on "More apps"
and choose a suitable software to view such files on your PC or from email attachments.
The CIV file type is primarily associated with 'Empire Earth' by Sierra Entertainment, Inc.. The original authors of the file were Stainless Steel Studios (now defunct), and then Mad Doc Software also made some for EE: AoC Xpack. Mad Doc then became part of Rockstar Games.