TrueVFS Extension
· Extension modules provide services to extend the TrueVFS Kernel with
some functionality OTHER than supporting a particular type of file
system.
Extension modules advertise their services on the class path in order
to make them locatable by the TrueVFS Kernel at runtime.
Download JD-GUI to open JAR file and explore Java source code file (.class .java)
Click menu "File → Open File..." or just drag-and-drop the JAR file in the JD-GUI window truevfs-ext-0.11.1.jar file.
Once you open a JAR file, all the java classes in the JAR file will be displayed.