The efs file extension is associated with the EasyFlow a diagramming and flow charting software package.
EFS file extension - EasyFlow file
What is efs file? How to open efs files?
File type specification:
The efs file extension is related to EasyFlow program. Interactive EasyFlow was a diagramming and flow charting software package produced by HavenTree Software Limited, of Kingston, Ontario Canada. It existed from 1981 until 1998, when it was bought out by SPSS Inc.
The EasyFlow is now obsolete product.