Find Programming Language Used

Try PEiD

of course if they used a packer, some unpacking will need to be done first :)

Start it up and check what run-time DLLs it uses with Process Explorer.

If that doesn't make it immediately obvious, search the web for references to those DLLs.

Most disassemblers (including Olly I think) can easily show you the text contained in an EXE or DLL, and that can also sometimes give a clue. Delphi types are often prefixed with T as in TMyClass.

If it's a small executable with no DLL references and no text you might be SOL. At that point you'd need to look for idioms of particular compilers, and it would be mostly guesswork.

You could try using Depends to see what runtime dependancies it has, which might give some clues.

The easiest way is to ask the developer of the program. It does not require any knowledge and utility programs.

• Determine Delphi Application
• Use eda_preview270.exe (from here) or some other spy tool and check the window class names. If they read like TButton or TfrmBlubb, it's a VCL app. If there is an "Afx" in them, it's probably MFC.

PE Detective works best for me.