I'm battling unresolved or incorrectly resolved xref's when more that one AutoCAD drawing is opened from different directory locations. In ACAD 2002 I corrected this problem by deleting the DDEexec subkey then turning off the "Create Subkey" and "Set Value" permissions under the HKEY_CLASSES_ROOT AutoCAD.Drawing.15.

Unfortunately the AutoCAD R2005 (AutoCAD.Drawing.16) software works a little different. Turning off the "Create Subkey" and "Set Value" options does not prevent DDE from turning on and prevents right click options from changing between different vertical products. In fact, if AutoCAD R2005 is current (but not open) the other right click options claim that there is no program associated with the .DWG file type.

The Engineers and drafters I work with usually have at least a couple of drawings (in different directories) opened at a time. We take full advantage of xref's and they must work correctly. Has any one expereinced this? ....found a fix for it? .....