AN IMC IFR C182 PLT ON A PCM RWY 10 GPS ENCOUNTERED A C172 AFTER A VOR 28 APCH IN WHICH HE TURNED A RWY 10 DOWNWIND. THE RPTR FAILED TO CNX IFR.

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THE RWYS AT PCM ARE RWY 28/10. A C172 WAS MAKING A VOR APCH TO RWY 28. ATC ADVISED THE C172 TO 'CANCEL ASAP' BECAUSE MY ACFT (182RG) AND A PIPER SENECA WERE INBOUND ON A RWY 10 GPS APCH. THE C172 PLT HAD A THICK FOREIGN ACCENT AND WAS DIFFICULT TO UNDERSTAND. I MONITORED THE UNICOM FREQ AND TPA APCH. THE C172 PLT CANCELED HIS IFR. AS I PASSED THE OM I WAS CLRED FOR THE APCH AND WENT TO UNICOM AND ASKED THE C172 HIS LOCATION. HE REPLIED HE WAS DOWNWIND FOR RWY 28. I THEN RECEIVED A TIS TFC CONFLICT ON MY MFD. NEXT; THE C172 PLT SAID HE WAS 'XING OVER' TO GO DOWNWIND FOR RWY 10. I WAS NOW DSNDING THROUGH 800 FT AGL IN RAIN AND CLOUDS. I HAD NO VISIBILITY DOWN OR FORWARD. WHEN I CAME OUT OF THE CLOUDS I INSTRUCTED THE C172 TO REMAIN DOWNWIND UNTIL I WAS ABLE TO LOCATE HIM VISUALLY. I WAS EXTREMELY DISTR WHILE AVOIDING A COLLISION AND FAILED TO CANCEL MY IFR FLT PLAN UNTIL APPROX 45 MINS LATER. I THEN CALLED FLT SVC AND THEY VERIFIED MY CANCELLATION WITH TPA APCH. THE C172 PLT CREATED A HAZARD BY NOT LNDG ON RWY 28 AS EXPECTED. HE WAS BELOW 500 FT WHEN I FINALLY SAW HIM PASS MY L WING. HE WAS DEFINITELY TRYING TO GO VFR UNDER SOLID IFR CONDITIONS.