It's a scenario we see every week: a Visual Basic 6 application has been running in production for fifteen or twenty years, it's business-critical — but its source code is gone. The contractor shut down, the developer's machine was reformatted, or the .vbp and .frm files lived on a server that no longer exists. Good news: as long as you have the executable, all is not lost.

What a VB6 .exe actually contains

A Visual Basic 6 executable is not an opaque black box. It carries far more information than most people assume:

  • The complete UI structure: forms, controls, menus, with all their properties;
  • The embedded resources: images, icons, strings;
  • The compiled logic, as P-Code or native machine code depending on the compilation mode;
  • The references to components — COM, OCX and ActiveX — that it uses.

Decompilation is the reverse of compilation: reconstructing, from this data, files you can open again in the development environment.

The method, step by step

1. Identify the compilation mode. First, determine whether your binary is P-Code or Native Code: it drives the whole recovery strategy. We cover the distinction in this dedicated article. In 9 cases out of 10, it's Native Code.

2. Recover the UI. This is the most reliable part: VBReFormer fully reconstructs forms (.frm), user controls (.ctl) and resources (.frx), even without any original source file. You get your screens back identically.

3. Decompile the logic. On Native Code, the decompiler translates x86 machine instructions back into readable Visual Basic: runtime calls, Win32 API declarations, procedure structure. Logic recovery is never guaranteed at 100%, but it provides a substantial starting point compared to a rewrite from scratch.

4. Rebuild the project. By assembling the recovered UI and the decompiled code, you reconstruct a VB6 project you can open, compile and maintain.

Start with a free diagnosis

Before any commitment, the free edition of VBReFormer lets you open your executable, identify its compilation mode and inspect the recoverable UI and resources. You know exactly what can be recovered before deciding anything.

To go further — full native code decompilation and project reconstruction — VBReFormer covers the whole chain. And if you only need to edit the UI without rebuilding everything, that's also possible directly inside the binary.

Make sure you hold the rights to the application in question — the most common case being recovering your own software.