I am trying to use the CFSTR_SHELLIDLIST clipboard format to allow the
creation of links to files for a drag and drop operation in a C# app.

I am obtaining PIDL's to the files in question and then setting up a
CIDA structure in global memory - reading it back it seems to be in the
format required in that the handles are recognisable and the offsets
appear to be correct.

I am confused about exactly what I should be copying to the Clipboard,
i.e. is it the pointer to the CIDA structure or do I need also to set
up a STGMEDIUM structure and copy that to the Clipboard?

I have tried both and SetClipboard data returns 0 which indicates the
data wasn't copied. (I use a similar function to set up a DROPFILES
structure and that works fine). I am calling RegisterClipboardFormat
and getting a valid return from that.

I haven't been able to find any examples of doing this, if anybody can
give me some clues or pointers to examples (I can probably translate
VB, C or C++) I would really appreciate it :-)

I can post my routine if that would help but it is a bit lengthy.