Vex Coding Studio doesn't seem to be the ideal coding studio at the moment. Sure, it's a brand new thing, and it's going to have it's flaws, but another IDE wil usually just be better. But, what if you want to use the official API still?
Well, I'm glad you asked. Introducing:
NotVCS is a python script that can extract and repack .vex files. Thats about all I have to say here. If you are interested in using it, it is available for free on this github repo.
This software is still in it's early stages and will almost certainly be riddled with bugs. Please make backups of your vex files before using.