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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 Record Descriptors: UDT Layout, Destruction and ANSI Translation Tables - Sandsprite 2026
This paper documents the internal binary structures Visual Basic 6 uses to describe user-defined types (UDTs), including field layouts, arrays, nested records, memory cleanup, and ANSI conversion. It also establishes that UDT descriptors share the same underlying format as the runtime's module, object, and procedure teardown tables (RESDESCTBL).
The format was reconstructed through automated compilation and analysis of 114 targeted VB6 test programs, independently reproducing their descriptors byte-for-byte and cross-checking the findings against MSVBVM60.DLL. The paper also examines the separate serialization structures used by VB6's Put/Get file operations.
The results provide a practical reference for VB6 reverse engineering, P-code disassembly, and decompiler development.