Thinking about starting a decomp project but god I literally have no idea how to start. Reversing a 4mb win32 exe just feels ... beyond me. I don't even know how I'd go about re-building the exe in a way I could verify my progress. 

 @e9a04693 If you can run it somewhere, trial and error with a debugger could help a lot. Are you interested in extracting some algorithm, do you want to modify its behavior, or do you want to recreate the whole thing?