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If you mean the one in the Documents folder, runnin g the game will recreate it. Of course any save files in there are gone.

Your only hope is a utility that recovers deleted files; there are many out there I'm sure but I wouldn't have used one for 20 years I'm sorry.
 
Add ck2game.exe to the exceptions list of your antivirus app; ESPECIALLY if you have Windows Defender, add it to the Ransomware "Apps Allowed Through" list.