https://community.graphisoft.com/t5/Modeling/Back-Saving/m-p/47399#M23985 Don't know any. You can save in AC9 only.<BR /> If you have AC9 open in it an resave in 8.1.<BR /> Otherwise try dwg, but you will have just lines. Thu, 07 Dec 2006 15:05:53 GMT Anonymous 2006-12-07T15:05:53Z https://community.graphisoft.com/t5/Modeling/Back-Saving/m-p/47398#M23984 <DIV class="actalk-migrated-content"><T>i have opened an ArchiCAD8.1 file in ArchiCAD10 and saved it. i now would like to open that file in ArchiCAD8.1 again. is there a way to backsave? retrofit? import? or otherwise???<BR /> thanks.</T></DIV> Thu, 07 Dec 2006 14:59:46 GMT https://community.graphisoft.com/t5/Modeling/Back-Saving/m-p/47398#M23984 Anonymous 2006-12-07T14:59:46Z https://community.graphisoft.com/t5/Modeling/Back-Saving/m-p/47399#M23985 Don't know any. You can save in AC9 only.<BR /> If you have AC9 open in it an resave in 8.1.<BR /> Otherwise try dwg, but you will have just lines. Thu, 07 Dec 2006 15:05:53 GMT https://community.graphisoft.com/t5/Modeling/Back-Saving/m-p/47399#M23985 Anonymous 2006-12-07T15:05:53Z https://community.graphisoft.com/t5/Modeling/Back-Saving/m-p/47400#M23986 It's possible, but you would need Archicad 9 to do it.<BR /> <BR /> Each version of Archicad can usually save one version back. From AC10, you can save back to AC9. From AC9, you can save back to 8.1. Thu, 07 Dec 2006 15:07:34 GMT https://community.graphisoft.com/t5/Modeling/Back-Saving/m-p/47400#M23986 TomWaltz 2006-12-07T15:07:34Z