>When we update foxpro 2.6 files from visual fox pro. Index tags that are based on for clauses get corrupted. Has anyone had this experience? Is there a solution -- short of re-writing the logic which is contained in the filtered index???

Are you still attempting to use the 2.6 files from 2.6? If so it is best to do the updates form there otherwise VFP makes some changes that prevent backwards compatibility.