Hi Bruno, The red surroundings mean that import plugin cannot open the model. One reason for that could be that you do not have any ifc import plugin installed to your machine at the moment. Please check the list of installed software, "Programs and Features" in Win 7 and "Add or remove Programs" in Win 10. Look for programs starting either "Trimble Solutions ImportSDK" or "Tekla Model Sharing Foundation". And then look for IFC plugin version number. That should be 2.41. If it's not or if you do not find any IFC plugin, then try to install Tekla BIMsight again to your machine. If that does not help, then please send email to admin@teklabimsight.com and I will help you by email. Best regards, Marko Myllymaa