9.0 Sp2 Portable [extra Quality]: Visual Foxpro

Guide to Visual FoxPro 9.0 SP2 Portable Microsoft Visual FoxPro (VFP) 9.0 Service Pack 2 (SP2) is a data-centric, object-oriented programming environment used primarily for developing desktop database applications. While Microsoft reached the "End of Life" for VFP years ago, it remains in use by various organizations for legacy workflows. What is a "Portable" Version?

Limitations and Quirks

• No COM registration system-wide – If your VFP code calls external COM objects (like Word or Excel automation), those objects must already be registered on the host machine. The portable VFP can use them but can’t register new ones.
• Help file quirks – The traditional .CHM help file may fail if the host system blocks CHMs from network or removable drives (a common security setting).
• ODBC/OLEDB limitations – VFP’s own drivers for accessing SQL Server or Oracle are still present, but system DSNs are not portable. You must use connection strings or file DSNs.
• Anti-virus interference – Some aggressive antivirus software flags portable executables as suspicious because they run without installation.

The "Portable Runtime" vs. "Portable IDE"

Understanding the distinction is crucial: Visual FoxPro 9.0 SP2 Portable

• Compatibility Issues: Visual FoxPro 9.0 SP2 Portable may not be compatible with newer Windows versions or certain third-party libraries and components.
• Limited Support: As VFP is an older technology, it may not receive the same level of support or updates as newer development tools and platforms.
• Security Concerns: VFP applications may be vulnerable to security risks, particularly if they are not properly designed or maintained.

• vfp9.exe – The main IDE executable.
• vfp9r.dll / vfp9t.dll – The runtime and multithreaded runtime DLLs.
• Registry-less COM registration – Instead of writing COM class IDs to the Windows registry, the portable version uses side-by-side assemblies (or simple REGFILE redirection) so that VFP’s CREATEOBJECT() calls still work.
• Relative paths – All default directories (HOME(), _SAMPLES, _VFP_STARTUP) are redirected to subfolders within the portable drive.
• Isolated resource usage – Temporary files, FoxUser.dbf (resource file), and project metadata are stored locally, not in %APPDATA% or %TEMP% in a way that conflicts with other VFP installs.