ILSpy VS UndertaleModTool

First, go grab this: https://github.com/icsharpcode/ILSpy. It's a decompiler that will break Rust down. Hope you like C#.

If its a C#/.NET exe you can use ILSpy to get the source code https://github.com/icsharpcode/ILSpy

Well, it might not be exactly what you're asking for, but ILSpy lets you choose what version of C# you wish to decompile an assembly to. This is great for learning how a specific feature used to be coded in C# prior to some new syntax/compiler feature being added.

You will thoroughly enjoy this, then.

I've only used their GUI frontend myself, but ILSpy is also available as a library and command line tool.

As you can see IL code is not exactly human readable, and it's also quite verbose. If you want to have an idea of how your code looks like in IL you can use a decompiler tool such as JustDecompile or ILSpy.

Take a random piece of C# software, run it through ILSpy, and be amazed at the results.

UndertaleModTool although made for modding Undertale and Deltarune, it works with most game maker games. Just open the data.win file with it and you now have access to most of the game's code, sounds and sprites. Look for spritemaps/texturemaps and edit those. Just use it for modding and having fun and don't do anything illegal with it.

The naming screen script does not decompile correctly in UndertaleModTool, so you'll need to replace with a fixed version and then be careful not to trust any re-decompiled output. The others... that's just automatic line break messing you up. You probably have to rearrange the text so it fits better, maybe even add extra textboxes if you can't fit the translation.

You don't need GameMaker. You need UndertaleModTool, which can edit most game assets (rooms, code, strings) in a self-contained manner and export the rest (sprites, sounds) for external editing. Download a GUI build (it doesn't really matter which) from here: https://github.com/krzys-h/UndertaleModTool/releases

Thanks! This works. I download from here (picked this version, "GUI-windows-latest-Release-isBundled-true-isSingleFile-true.zip",idk what's the difference between them)

Tool Link: https://github.com/krzys-h/UndertaleModTool Yep, its an undertale tool, no joke. But its advertised as for multi-GM titles. though think I'm the first known one to use it on KZ lol or maybe not who knows.

you can use the deltarune mod tool to export all sprites from the data.win file

Everything is in game.unx, which is the same as data.win for Windows. You can dump certain asset types using UndertaleModTool, which has a Windows version (which oughta work through Wine) and a cross-platform CLI version. Download

After you've made a couple small games on your own - without being dependent on tutorials that handhold you through the process, that is - you should be able to pretty easily read and modify the decompiled code generated by UndertaleModTool after opening Undertale's/Deltarune's data file in it: https://github.com/krzys-h/UndertaleModTool

if it's a newer one like Undertale or Deltarune use UndertaleModTool