+1  A: 

I don't think that alternate data streams are used for this. It's more likely based on what Microsoft calls Structured Storage (which used to be called compound file binary format).

jdigital  2009-03-07 17:29:47
Hi, why can I add it to any (empty) file as well? I'm quite sure it is saved as ADS in this case, but I need to confirm. But I think the IStorage interface could be the pointer in the right direction.
Martin C.  2009-03-08 08:59:25
I reread your post more carefully, and you are correct. I thought the dialog was from a Word document and that's why I pointed you towards Structured Storage. Sorry!
jdigital  2009-03-08 16:32:08

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