ID:1652652
 
(See the best response by LordAndrew.)
I want to use DM to process a load of changes to the map, en-masse. However, this only needs to be done once (to save me manual labour) - is there a way to save the map as a DMM, so that I can open it in DreamMaker and continue to edit it afterwards?
Best response
There's no built-in way to do this, but there are a few libraries around that can do it for you:

http://www.byond.com/developer/LummoxJR/SwapMaps
http://www.byond.com/developer/AJX/MapHandling
http://www.byond.com/developer/FIREking/Massive
http://www.byond.com/developer/IainPeregrine/dmm_suite

I can't attest to which one is the better option though.
Thank you very much; I had a quick look at each, and I think dmm_suite is going to be perfect for the job! Thanky-sai!