Notes about the CIV file extension:
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries, unused processes and other unfavourable system settings to identify slowdown issues.
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.