OK - there is DEFINITELY different behavior going on.
It seems that this might be tied to where things are placed on what hard drives, and that if the source and target are on the same drive, Windows seems to do a Move, and if source and target are on different hard drives, Windows seems to do a Copy instead.
Please someone on Windows 7, Windows 8, and Windows 8.1 test this out both from two folders in Windows (dragging a file from one folder to the other), where one folder is on one drive and the target on another, and also test out when both source folder and target folder are on the same drives.
Additionally, if perhaps the same folks could test out dragging from a midi track in Sonar to a destination folder on I guess their C: and also a destination folder that resides on a different hard drive, that would be GREAT.
Another thing I am not quite sure of is how Windows sees the midi track's origination drive. Does it attach to where the project folder resides? Does it attach to the hard drive where the Sonar program resides?
It DOES seem to matter.
Bob Bone