https://community.graphisoft.com/t5/Installation-update/DLL-problem/m-p/176622#M19425 <DIV class="actalk-migrated-content"><T>When I want to start AC13, warning window appears: "The application or DLL C:\Program Files\Graphisoft\ArchiCAD 13\Tdx.dll is not a valid Windows image. Please check this against your installation diskette." <BR /> I didn't find the file on my installation CD. <BR /> Untill now, everything worked properly.</T></DIV> Wed, 21 Jul 2010 11:28:28 GMT Anonymous 2010-07-21T11:28:28Z https://community.graphisoft.com/t5/Installation-update/DLL-problem/m-p/176622#M19425 <DIV class="actalk-migrated-content"><T>When I want to start AC13, warning window appears: "The application or DLL C:\Program Files\Graphisoft\ArchiCAD 13\Tdx.dll is not a valid Windows image. Please check this against your installation diskette." <BR /> I didn't find the file on my installation CD. <BR /> Untill now, everything worked properly.</T></DIV> Wed, 21 Jul 2010 11:28:28 GMT https://community.graphisoft.com/t5/Installation-update/DLL-problem/m-p/176622#M19425 Anonymous 2010-07-21T11:28:28Z https://community.graphisoft.com/t5/Installation-update/DLL-problem/m-p/176623#M19426 You may want to try two things:<BR /> 1. Check for any virus.<BR /> 2. Reinstall the program. Thu, 22 Jul 2010 08:06:34 GMT https://community.graphisoft.com/t5/Installation-update/DLL-problem/m-p/176623#M19426 Laszlo Nagy 2010-07-22T08:06:34Z