1 New project, import a WAV by "reading directly". 2 Save project and quit without copying in the WAV. 3 In the project's _data folder, paste a valid .au file from another project and rename it with the same filename as one of the .auf files, but keep the .au extension. 4 Reopen the project and the .au orphan will not raise the "orphaned blockfile" dialog or show in the log. This (probably) could not happen in normal course of events in 1.3 but to test the orphan non-detection in a real world 1.2 project, see: http://www.gaclrecords.org.uk/bugs/bug_137_downing.zip