Probably because FDO 3.8 introduces no new APIs since 3.7, so the provider dlls technically work - Jackie -- View this message in context: http://osgeo-org.1560.n6.nabble.com/Cannot-connect-to-large-SDF-files-anymore-tp5014329p5030821.html Sent from the MapGuide Users mailing list archive at Nabble.com.