FUTURE VERSION

AFTER UPDATING FROM 2007 TO 2008 AND SP04 GOING TO A SLDPRTWHICH WAS FINE PRIOR I AM GETING THE FOLLOWING MESSAGE "CAN NOTOPEN MY FILE NAME SLDPRT FUTURE VERSION" WHAT IS THIS AND HOW DO ICORRECT IT SO THAT ICAN STILL USE MY SLDPRT?
THANKS
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