Foxpro Decompiler File

To understand decompilation in FoxPro, one must understand how the language compiles.

Unlike languages such as C++, which compile down to assembly/machine code, Visual FoxPro usually compiles into P-Code (Pseudo Code). P-Code is an intermediate step—a set of instructions that the FoxPro runtime engine interprets.

Because FoxPro is an interpreted language at its core, the structure of the code remains largely intact within the compiled file. The metadata describing forms, controls, and object hierarchies is typically stored in tables (which is what SCX and VCX files actually are—specialized DBF tables). This architecture makes FoxPro applications significantly easier to decompile than applications written in C++ or Delphi. The "decompilation" often involves simply reading the internal table structures that are embedded in the EXE or APP file.

| Tool | Supports VFP 9 | Form recovery | Variable names | Accuracy | |---------------|----------------|---------------|----------------|----------| | ReFox | Partial | Medium | Low | 80%? | | UnFoxAll | Yes | High | Medium | 85% | | DFox (modern) | Yes | Medium | Medium-high | 90% |

(You would fill in based on actual testing.)

The most common scenario. The only copy of the source was on a developer’s laptop that died, or the backup tape from 2007 is unreadable. The decompiler becomes your emergency recovery tool.

Unlike decompilers for fully compiled languages like C++ (which produce assembly-like output), FoxPro’s pseudo-code is much higher-level. The compiled .fxp file contains tokenized representations of FoxPro commands, functions, object properties, and event code. A decompiler reads this token stream, matches each token against a known dictionary of FoxPro keywords, reconstructs control structures (IF...ENDIF, DO WHILE, SCAN), resolves variable names (often stored in symbol tables), and outputs plain .prg (program) or .scx (form) source files.

Advanced decompilers go further: they attempt to restore original comments (if preserved), recover user-defined function names, and even rebuild the visual layout of forms and reports. However, some information is always lost: local variable names may be generic (L1, L2), whitespace formatting disappears, and compiler optimizations can remove unreachable code or collapse expressions. The result is functionally equivalent source code that is readable and recompilable but may lack the original developer’s stylistic touches.

Assess the decompiler’s ability to recover source code from compiled FoxPro files (.fxp, .app, .exe).

ReFox is the industry standard for FoxPro decompilation. It is virtually synonymous with the term "FoxPro decompiler."

Decompilation is not magic. It cannot recover what isn't there.

Attach a FoxPro debugger (like VFP’s built-in debugger or a third-party tool) to the running EXE. Step through the code and manually transcribe critical routines. Tedious but works for small patches.