Windows always checks the application's local folder for .dll files before checking system folders. This is the safest method for legacy apps because it avoids modifying the global system.
Some older applications do not look for DLLs in the Windows system folders; they look only in their own installation directory. This is common with USB or network-deployed apps.
The application was built with VFP 9, but only VFP 7 runtimes are present.
Visual FoxPro applications cannot run as standalone .exe files; they need specific support files (DLLs) to function. This is common when trying to run older business software on Windows 10 or Windows 11.
Because Visual FoxPro is end-of-life, some organizations are moving to (using tools like VMware ThinApp or Cameyo) to package the runtime and the legacy app together. This isolates the dependencies from the host OS.