.VEF File

The vef file extension is nowadays mostly known to be associated with a special backup file generated with contacts backup function on certain HTC devices.

It appears to be a variant of password protected VCF file that is saved on memory card.

How to open:

It seems that you can recover these files only in the original device, but you also need to know the password.

How to convert:

A direct conversion seems unlikely, you would have to first decrypt the files.