Hello, In my cell directory I have sch.cdb file which is used to open a design in the virtuoso composer window. I have some old design files which have a .oa extension (like sch.oa). When I try to open these views I get an error from Cadence in the icfb window "*WARNING* ddMapGetFileViewType: You are trying to run a CDB executable on an OA library file 'sch.oa'. The file is in library 'CMOSedu_Ch20_1u' in cell 'fig20.4' in view 'schematic'. You must run an OA executable to use that library file." Does anyone know where I can find a OA executable Thanks GM