What's an extension?
There's been some discussion and perhaps a bit of confusion about REBOL extensions (previously called plugins.)
Well, first let me mention that the official definition of REBOL Extensions is now published. (And, if you think you can help improve it, go ahead, it's a wiki, or at least relay your ideas on R3 Chat group #5045).
Here's a clarification that should help:
A user asks, "Can I package all my special data into a module or extension? I don't want to scatter it around in separate files." The answer is yes, you can. Just include it in your module or extension as you would any other data.
If that question was meant to be: "Is there a tool for making that inclusion automatic?" My answer would be that such a "helper" script is quite useful, and I'm sure that one or more persons in the R3 community can provide it quite soon.