This is a Gamemaker: Studio project recompiler, I'm building it based on data by WarlockD's GMDSam ( Underdecomp ), this means that you'll have to download and use that first.
Link: https://github.com/WarlockD/GMdsam
To use this, simply download the exe file, then put it in the same folder as the Underdecomp exe. You'll then need to run the exe and then you just need to press all the buttons, with the "Create Project" last. All features are available, some code and id's may be problematic, this will be fixed soon.
The bugs CAN be fixed manually, if you want to know how, just write to me here: https://www.reddit.com/r/Underminers/comments/5powry/wip_gamemaker_studio_recompiler/
If the program doesn't respond, no worries, it's just working, if any errors come up, restart it.
Thank you to Colinator27 for helping me out with this project.
I AM NOT RESPONSIBLE FOR ANY ILLEGAL USE OF THIS.
PLEASE NOTE THAT YOU MAY NEED TO CONFIGURE A FEW THINGS IN GAMEMAKER STUDIO ITSELF.