svaero:
Use the Open command to open Layout or pmk files, the Layouts will be added to the Layout book. The Layout files might need to be opened and saved in PlotMaker 9 (which came with ArchiCAD 9) to be accessible to current ArchiCADs (I have not done this recently). If you have ArchiCAD 10 you can read its New Features Guide for more information on the conversion process.
You should add a Signature to your Profile (click the Profile button near the top of this page) with your ArchiCAD version and operating system (see mine for an example) for more accurate help in this forum
David