W3MIFxxx.DLL is the Win32 Pervasive Microkernel Interface DLL. It's used indirectly by Btrieve application to communicate with the Btrieve engine. Looking at the version (126.96.36.199), you are running the original version of P.SQL V8. You should update to P.SQL v8.7. There have been 4 updates to the 8.x engine.
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