I have a project that I am trying to fix from a guy that left (let go) from my company. He has violated every fundamental principle of software engineering, not using source control, not backing up the source before you make more changes, etc. etc.
I need to make changes to an application that is in the field and I don't have the original source code, but I have an executable. What I need is a decompiler that will decompile a Visual Studio 6 C++ application and provide me with some type of source code. Anyone got any ideas.....
Well there's the Decompiler from Hex-Rays: http://www.hex-rays.com/decompiler.shtml
It is pretty good for the fact that it is creating C code from Assembler but it works pretty good. It's also pretty expensive
Edit: Additional note it is combined with IDA Pro the pretty well-known disassembler from them. That already can show you a lot of information in the combination with the decompiler it is even easier to reverse code.
Decompile to what - assembler?
There isn't anything that is going to give you meaningfull C from an exe.
I've used RecStudio (rec22) and IDAPro to try and decompile a C++ project, together they probably wouldn't have been enough to do the job I had except that I worked out the demo project the program was based on so they gave just enough info that I could make something like the same project again.
In the end one other thing I was doing was compiling code that I thought matched and checking that I got the same result in the decompiler.
Good Luck.
来源：https://stackoverflow.com/questions/3928318/is-there-a-decompiler-that-will-work-on-visual-studio-6-c