I'm pretty sure that neither the zip nor the jars will break if you open them up
- jinput.jar - JInput classes
- lwjgl.jar - LWJGL classes
- lwjgl_debug.jar - LWJGL classes in debug version
- lwjgl_test.jar - LWJGL tests
- lwjgl_util.jar - LWJGL util classes
- llwjgl_util_applet.jar - LWJGL applet loader
To run an LWJGL application you at the very minimum need lwjgl.jar (or lwjgl_debug.jar if debugging).
If you need Controllers, you need to add jinput.jar
To make life easier you may use the utility classes in lwjgl_util.jar