While not true decompilers, some open-source projects can convert running FoxPro code into C# or Python by reflecting on runtime behavior. This is less reliable but cost-free.

The existence of these tools raises significant legal questions.

Legitimate Use: The primary legal justification for using a decompiler is source Code Recovery. If a company owns the rights to a specific application but the original developer has passed away, disappeared, or lost the archives, decompilation is often the only way to migrate the software to a new system or fix critical bugs. In this context, the owner is essentially unlocking their own property.

Illegitimate Use: Conversely, these tools are frequently used for software piracy and IP theft. Competitors can decompile a rival's software to steal algorithms, or hackers can reverse-engineer licensing routines to create "cracked" versions of commercial software.

In many jurisdictions, reverse engineering software is a violation of the End User License Agreement (EULA) unless specific exceptions apply (such as interoperability). Using a decompiler to steal code is a clear copyright violation.

A lesser-known but reliable tool that focuses on EXE and APP files, producing readable PRG files and SCX forms.

If you are reading this because you are desperate to maintain a 20-year-old FoxPro app, take a step back. Decompilation is a band-aid, not a cure.

Ask yourself:

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.

Some FoxPro developers used third-party obfuscators (e.g., “FoxLock,” “SafeCompile”) that scramble p-code structure. Decompiling obfuscated code yields gibberish or broken logic. You would need the original obfuscation key.

Because FoxPro applications are so easy to reverse-engineer, developers have historically used third-party tools to protect their intellectual property.

| Element | Recovered | Notes | |---------|-----------|-------| | Procedures / Functions | Yes / Partial / No | | | Variable names | Original / Renamed | | | Form definitions (SCX) | Embedded / Separate | | | Comments | Preserved / Lost | | | Macro substitution | Restored / Broken | |