AutoCAD .NET :: How To Fetch XREF Found At Path When Using No Path While Attaching

I am attaching a File as a xRef. At the time of Attachment, I select attach as attachment, and No Path in Path.

Now if I try to fetch detail of this file using MdiActiveDocument.Database and BlockTableRecord, I gets only file name not the path. However, In AutoCAD we can see the file path under "Found At". Can we read / fetch this using C#.

In case of Full Path or relative Path, I gets full path in btr.PathName

Here is my code  and  I am using AutoCAD 2013

Database db = acadApp.DocumentManager.MdiActiveDocument.Database;
using (Transaction Trans = db.TransactionManager.StartTransaction()) {
BlockTable BlkTbl = (BlockTable)Trans.GetObject(db.BlockTableId, OpenMode.ForRead,false,true);
db.ResolveXrefs(false, false);

[Code] ...........