If I try to drag and drop a xisf file in PI on OSX 10.10.1, I get this error:
PixInsight Core 01.08.03.1123 Ripley (x64)
Copyright (C) 2003-2014 Pleiades Astrophoto
----------------------------------------------------------------------
Welcome to PixInsight. Started 2015-Jan-14 21:57:34 J2457037.41498 UTC
* Parallel processing enabled: Using 8 logical processors.
* Thread CPU affinity control enabled.
* PSM AutoSave enabled. Auto-save period: 30 seconds.
open "file:///.file/id=6571367.25023746"
Reading 1 file(s):
*** Error: Unknown or unsupported file type:
file:///.file/id=6571367.25023746
** No files were loaded.
loading these same files via file-->open seems to work ok