Notes about the CEF 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 CEF file type is primarily associated with 'CenturionMail' by CenturionSoft. CenturionMail is a security program for encrypting E-mails as well as files/folders. CenturionMail uses self-decrypting technology so your recipient needs nothing to open the encrypted email except the password.