https://community.graphisoft.com/t5/Installation-update/HTML-File-or-Viewer-Error-Message/m-p/151395#M17003 Would also be good to know you AC version. <BR /> AC 13 is the only Windows 7 compatible version. Mon, 07 Dec 2009 02:18:32 GMT Laszlo Nagy 2009-12-07T02:18:32Z https://community.graphisoft.com/t5/Installation-update/HTML-File-or-Viewer-Error-Message/m-p/151393#M17001 <DIV class="actalk-migrated-content"><T>Using Windows 7 32 bit, when I click on Help links in Archicad this error message appears. Also updates are not done.</T></DIV> Fri, 04 Dec 2009 05:44:25 GMT https://community.graphisoft.com/t5/Installation-update/HTML-File-or-Viewer-Error-Message/m-p/151393#M17001 Anonymous 2009-12-04T05:44:25Z https://community.graphisoft.com/t5/Installation-update/HTML-File-or-Viewer-Error-Message/m-p/151394#M17002 Maurice, I think your post is missing a screen-shot.<BR /> <BR /> Also, what is your default browser? Sat, 05 Dec 2009 02:38:20 GMT https://community.graphisoft.com/t5/Installation-update/HTML-File-or-Viewer-Error-Message/m-p/151394#M17002 vistasp 2009-12-05T02:38:20Z https://community.graphisoft.com/t5/Installation-update/HTML-File-or-Viewer-Error-Message/m-p/151395#M17003 Would also be good to know you AC version. <BR /> AC 13 is the only Windows 7 compatible version. Mon, 07 Dec 2009 02:18:32 GMT https://community.graphisoft.com/t5/Installation-update/HTML-File-or-Viewer-Error-Message/m-p/151395#M17003 Laszlo Nagy 2009-12-07T02:18:32Z