Files with gef file extension can be found as geotechnical data files in Geotechnical Exchange Format.
GEF file extension - Geotechnical Exchange Format
What is gef file? How to open gef files?
File type specification:
The gef file extension is related to Geotechnical Exchange Format, a general language structure for storing and transferring geotechnical information.
GEF states in a procedural way how a new structure (a set of rules for the storage of measurements) should be composed. This report provides a basis for a general exchange of digital cone penetration test data.
This gef file type entry was marked as obsolete and no longer supported file format.
This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.