VB5/6 Native Code

VB6 Native Code Decompiler and x86 Analysis Workspace

Native-compiled VB5/6 programs contain x86 machine code plus VB5/6 runtime patterns and project metadata. Effective analysis needs readable reconstruction and the ability to verify every conclusion against disassembly, addresses, registers, stack state, and raw bytes.

Inspect Native Code free Read the Native Code guide

One binary, several synchronized views

Decompiled view

Reconstructed expressions and VB-aware operations help explain what a procedure does.

Disassembly

x86 instructions, addresses, and calls let the analyst verify low-level behavior.

HEX editor

The current code addresses can be inspected and patched in their binary context.

Step-by-step tracer

Emulation exposes CPU and FPU registers, stack, variables, and state without relying only on static guesses.

Full-size VB Decompiler Native Code recovery comparison showing improved reconstructed code — A full-size Native Code example shows how recovered variables and VB5/6 operations become more useful as analysis improves.

What the editions provide

Task	Lite	Licensed editions
Open supported VB5/6 Native Code files	Yes	Yes
View native x86 disassembly	Yes	Yes
Recover high-level code	No	Depending on edition
Advanced tracing, analytics, and editing tools	No	See Detailed Features

Recovery boundary: VB Decompiler can recover up to 80% of code from a typical supported, non-obfuscated VB5/6 Native Code application. Compilation and optimization flatten expressions, reuse registers and stack slots, inline operations, and remove source names and types. The result normally cannot be recompiled immediately: remaining decompiler incompatibilities and issues must be investigated and corrected manually.

Use AI Helper after static decompilation

The built-in AI Helper can process selected recovered code through prepared prompts using either a local offline model or the OpenAI API. It can suggest clearer structures and names and help explain difficult fragments, while the analyst verifies those suggestions against x86 disassembly, tracing results, raw data, and surrounding VB5/6 procedures.

How to approach a large native project

Identify the form, event, API, string, or address connected to the behavior you need.
Use search and references to narrow the project before reading routines.
Compare decompiled and disassembled views; inspect raw bytes when an address or operand needs confirmation.
Trace difficult paths step by step and record inferred variable and function roles.
Rename symbols and optionally use AI Helper to improve selected decompiled code, then validate the reconstructed logic.

Continue by task

Start with free native disassembly

Lite lets you open the file and inspect native x86 disassembly before deciding which high-level recovery and analysis features you need.

Download VB Decompiler Lite