https://community.graphisoft.com/t5/Modeling/Archicad-18-to-archicad-16/m-p/219002#M118818 You can "Save As…" from AC18 to AC17, then open the new file in AC 17 and "Save As…" AC16. I don't think the 64 bit v 32 bit has any effect. Mon, 28 Sep 2015 21:29:55 GMT Anonymous 2015-09-28T21:29:55Z https://community.graphisoft.com/t5/Modeling/Archicad-18-to-archicad-16/m-p/219001#M118817 <DIV class="actalk-migrated-content"><T>Hello:<BR /> <BR /> Can i open some file made in Archicad 18 64 bits with Archicad 16 32 bits?.<BR /> <BR /> Thanks.</T></DIV> Mon, 28 Sep 2015 21:25:06 GMT https://community.graphisoft.com/t5/Modeling/Archicad-18-to-archicad-16/m-p/219001#M118817 Anonymous 2015-09-28T21:25:06Z https://community.graphisoft.com/t5/Modeling/Archicad-18-to-archicad-16/m-p/219002#M118818 You can "Save As…" from AC18 to AC17, then open the new file in AC 17 and "Save As…" AC16. I don't think the 64 bit v 32 bit has any effect. Mon, 28 Sep 2015 21:29:55 GMT https://community.graphisoft.com/t5/Modeling/Archicad-18-to-archicad-16/m-p/219002#M118818 Anonymous 2015-09-28T21:29:55Z