AFTER LNDG YW3G IN POOR VISIBILITY CONDITIONS AND BACK-TAXIING ON THE RWY; A CL65 CREW BECAME CONFUSED AND UNSURE OF THEIR LOCATION.

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DURING ARR AT THE WINNIPEG INTL ARPT IN CANADA; WE PLANNED ON AND BRIEFED LNDG ON RWY 36. THIS RWY WAS LONGEST AND HAD CAT II LIGHTING; EVEN THOUGH WE JUST HAD CAT I CAPABILITY. JUST BEFORE THE APCH WE WERE TOLD THAT ALL LIGHTING FOR THAT RWY WAS LOST. CONSEQUENTLY WE HAD TO BRIEF QUICKLY FOR THE CAT I ILS TO RWY 31. MINIMUMS WERE 2600 FT RVR AND CURRENT RVR WAS HOVERING NEAR 3000 FT RVR AT THE TIME OF THE APCH. THE FO WAS THE PF AND HIS FLAME IN THE LNDG WAS HIGH DUE TO THE POOR VISIBILITY AND THE DIFFERENT CANADIAN RWY MARKINGS. AFTER LNDG; WE WERE TOLD TO 'BACK TRACK ON RWY 31 TO JOIN TXWY V FOR THE RAMP.' VISIBILITY VARIED ON THE GND AND IN SOME AREAS SEEMED WELL BELOW 3000 FT RVR. WE PASSED TXWY A ON THE BACK TAXI. THE NEXT TXWY ON THE ARPT DIAGRAM WAS TXWY V. TXWY/RWY SIGNS WERE POORLY LIT AND HARD TO SEE. I SAW A BLUE LIT TXWY TO MY L AND TURNED ON IT. CONFUSION SET. THE FO THOUGHT WE WERE ON A RWY; BUT WAS NOT SURE. I FELT SAFE THAT AT LEAST WE WERE ON A TXWY DUE TO THE BLUE LIGHTS AND YELLOW TAXI LINE. WE HAD IN FACT TURNED ONTO RWY 7/25 INSTEAD OF TXWY V. NO TFC CONFLICTS RESULTED. EVENTUALLY; AS WE TAXIED DOWN RWY 7 TO THE E; WE SAW GREEN RWY STANT BANS. CONFUSION WAS VERY HIGH AT THIS POINT. GND CTL NOTICED WE HAD LOST OUR WAY AND TOLD US TO CONTINUE AND TURN R ON TXWY F AND CONTINUE TO THE GATE. WE ACCOMPLISHED THIS WITH NO FURTHER INCIDENT. CONTRIBUTING FACTORS WERE A LONG DUTY DAY AFTER A REDUCED REST PERIOD THE NIGHT BEFORE; LOW VISIBILITY; AND POORLY MARKED TXWY/RWYS. ALSO; THE NONSTANDARD USE OF BLUE TAXI LIGHTS ON A DISPLACED THRESHOLD/RWY WHEN THE ARPT DIAGRAM DEPICTS A REGULAR DISPLACED THRESHOLD. IN THE FUTURE; I WILL STOP AND SET MY BRAKES AND NOTIFY ATC IF I AM UNSURE OF MY LOCATION. A NOTE OF NONSTANDARD MARKINGS ON THE FRONT OF THE ARPT DIAGRAM AND A NOTE ON LOW VISUAL PROGRESSIVE TAXI CAPABILITY OF GND CTL WOULD BE GOOD FACTORS IN PREVENTING A FUTURE OCCURRENCE. I WOULD HAVE ASKED FOR A PROGRESSIVE IF I THOUGHT THEY HAD GND RADAR.