I doubt it's possible, but...

[Travveh]

Is it possible to convert an .exe file back into its original programming language?

~Noobie Trav

[Aziz]

Well, theoretically I guess it is possible, however (especially depending on the language), this could be difficult and/or non-productive. Many compilers optimize code, and the code will be messy and non-imformative (no names for variables, methods, etc).

I've used one to reverse-engineer Java .class files before, and it wasn't pretty.

But best wait until one of the gurus get here.

Btw, what is it you're wanting to use this for?

[rizzix]

There are a few good disassemblers out there, but most of them disassemble to some assembly language.

You should search for a assembly -> higher level language compiler. Such compiler would generate code in the language you desire.

I heard for windows IDA Pro is a good disassembler/debugger. It's not free though.

There might be some good opensourced ones too. I don't know much about the assembly -> higher level language compilers though. Java has some, but they do a direct bytecode -> java compilation.

But keep in mind, like Aziz said, compilers do quite a bit of optimization. So the resulting code may look a lot different form the original.

[Aziz]

rizzix, by bytecode -> java compilation, do you mean .class -> .java?

[rizzix]

yep