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Over the years I have invested heavily in product R&D building a wide
assortment of new skills, and fostering a diverse background and understanding.
These are some of the papers I have developed along my journey that I make freely available to help others along. |
Sandsprite Papers
Artificial Intelligence
VB6 P-Code / Reversing
Scripting Arbitrary VB6 Apps
Recovery of VB6 prototypes
VB6 P-Code Disassembly
Writing a P-Code Debugger
VB6 P-Code Obfuscation
Binary Data Hiding in VB6
Binary Reuse of VB6 PCode
Parsing VB6 Form Controls
VB6 Variable Initilization
VB6 Record Descriptors (UDT)
VB6 Pcode Reference
Reverse Engineering / Binary Analysis
Visual Basic 6
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VB6 P-Code Opcode Reference: Runtime Handler Analysis and Compiler Verification - Sandsprite 2026
This reference documents the Visual Basic 6 P-code instruction set, including opcode formats, operands, runtime handler behavior, and instruction semantics. It builds upon decades of accumulated VB6 reverse-engineering research, extending the existing opcode tables through automated analysis of MSVBVM60.DLL and systematic compiler-generated testing.
The research combines IDA-based runtime handler analysis with approximately 3,070 targeted VB6 test programs to correlate source-level constructs with their compiled P-code representations. AI-assisted analysis was used to reconstruct instruction behavior, identify undocumented operations, and cross-reference findings against the runtime implementation.
The resulting searchable reference covers 1,165 opcode dispatch slots and 775 distinct handlers, providing a technical foundation for VB6 P-code disassembly, decompiler development, and further reverse-engineering research.
An open source interactive viewer app is also available.