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VB Decompiler
VB Decompiler is an advanced tool that can decompile programs (EXE, DLL, or OCX) written in Visual Basic 5.0/6.0 and disassemble programs based on .NET technology. As you know, programs written in Visual Basic can be compiled to interpreted p-code or to native code, and a .NET assembly is always compiled to Microsoft intermediate language (MSIL).
Since p-code consists of high-level commands, most code can be decompiled to source (without the names of variables and some functions). VB Decompiler supports up to 1400 p-code commands and restores source code as precisely as possible. Then you can manually finish that source code and try to compile it again.
In case of a program compiled to native code, VB Decompiler will recover as much of the source code as possible; it achieves a higher success rate than any competitive product. Even in this situation, VB Decompiler can help you analyze the program. It contains a powerful disassembler/emulator that will try to decode as many assembler instructions as possible to the most likely VB commands. Of course, VB Decompiler may fail on some assembler code optimizations and may be unable to recover some code. However, currently it provides the best approach to analyzing native-code applications.
In case of a program compiled to a .NET assembly, VB Decompiler will recover all tables and modules from a managed assembly and disassemble all methods, functions, and events using the IL disassembler. Decompilation to original source code is not possible at this time, but we provides decompilation service. VB Decompiler does not require the .NET Framework to be installed for decompilation. Decompilation is supported on all 32-bit Windows operating systems.
VB Decompiler can decompile all GUI Forms and User Controls from the file. It can also show the offset of each control.
As you can see, VB Decompiler is a great program analyzing tool. It can be a life-saver if you have accidentally lost your source code and need to partially restore your project.
| Features of the VB Decompiler | Lite | Personal Educational Home | Business | Business with Tracing Features | Business with Analytic Features |
| Decompiling of the forms (frm and frx) and usercontrols (ctl, ctx) |  | | | | |
| Code decompilation for the P-Code compiled applications. Recovery pseudo code to the standard Visual Basic instructions with a highest success rate. Processing COM OLE objects, API calls, etc. | | | | |
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| Native Code procedures disassembling (with powerfull Pentium Pro disassembler, with support of the MMX and FPU instruction sets) | | | | | |
| Partially Native Code decompilation (using code emulation engine) | | | | |
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| Disassembling Visual Studio .NET (VB, C#, etc.) applications | | | | |
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| Universal x86 unpacker for packed applications (supported UPX, NSPack and other popular compressing tools) | | | | | |
| Two decompilation schemes (with and without stack parsing) | | | | |
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| Recovery and edit the String References with unicode support | | | | |
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| Syntax coloring in decompiled code | | | | | |
| Recovery API calls. Recovery prototypes of most standard Win32 APIs | | | | | |
| Fast decompilation scheme | | | | |
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| Anti-decompilation features to protect your software (obfuscator) | | | | |
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| Powerfull HEX Editor with Copy/Paste and Undo/Redo features | | | | |
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| Save a decompiled data to the single file | | | | | |
| Save procedures list to the MAP file, IDA script or to the HIEW Names file | | | | |
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| Using VB Decompiler to decompile copyrighted code, commercial code, malware analyzing and/or to decompile code for any commercial project | | | | |
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| Activation and using VB Decompiler in a company (one license for one developer) | | | |
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Tracing code from procedures and functions of Native Code compiled Visual Basic 5.0/6.0 applications. Code will not started and will be emulated by VB Decompiler. | | |
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Get Analytic Report on the areas (procedures and functions) of the program that perform various manipulations with files, registry, windows, processes, as well as using service functions of Visual Basic to call functions by name (CallByName) and direct access to memory addresses (VarPtr). | |
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Minimum System Requirements (for v9.0 or later): 1,3 Ghz x86 processor, 1Gb RAM, Windows XP/2003/Vista/2008/7/8/8.1/10
Screenshots of VB Decompiler Pro:
 Decompiling Code |
 Disassembling Code |
 Decompiling Forms |
 HEX Editor |
 String References |
 Decompiling API |
* Microsoft, Windows, and Visual Basic are registered trademarks of Microsoft Corporation.