How to Download and Install WinQSB on Windows 7 (64-Bit) WinQSB is a classic software suite used for decision support in management science and operations research. However, because it was originally designed for older 16-bit or 32-bit environments, it is not natively compatible with 64-bit versions of Windows 7. Attempting a direct installation usually results in an immediate error message.

If your version of Windows 7 supports it, follow these steps: Download XP Mode:

  1. Download msflxgrd.ocx and comdlg32.ocx from a trusted source (Microsoft VB6 redistributable).
  2. Copy both files to C:\Windows\SysWOW64 (not System32 – that’s for 64-bit files).
  3. Open Command Prompt as Administrator.
  4. Run: 
    regsvr32 C:\Windows\SysWOW64\msflxgrd.ocx
regsvr32 C:\Windows\SysWOW64\comdlg32.ocx
  5. You should see: "DllRegisterServer succeeded".

Important note: only download installers from trusted sources. Verify files with antivirus before running.