An EPICS R3.13 extension directory has the following directory structure:
extensions/ Makefile config/ src/ Makefile extension1/ extension2/ ...
where config is a directory containing build configuration files and extension1, extension2, ... are EPICS extensions (subdirectory trees containing Makefile and Makefile.Host files, and source files to be built).
The extensionsConfig gnuzipped tar file contains the extensions/config directory and the build configuration files.
The following tar files contain source code only (no binaries), and were compressed using gnuzip.