If you are using a recent GM version and have “use x64 runtime” enabled in Game Options - Windows, you’ll have to compile the DLL yourself to target x64.
Is the recompiled x64 DLL allowed to be shared? I have spent hours trying to figure out where to even start because I don't know how to and nothing I'm searching for is giving me helpful instructions on how to actually recompile it myself
How can I recompile the DLL? Can you do that from gamemaker or should I get to the source code and build the dll on visual studio? If thats the case where can I find the source code of the extension?