"DrgQueryFormat", as a starter:
https://www.gladir.com/CODER/COS2/drgqueryformat.htmULONG DrgQueryFormat(PDRAGITEM dragItem, PCSZ a, ULONG b, PCSZ c, ULONG d);
Translation: "This function allows to query the data format of a drag operation."
The fun part will be to find out what "a", "b", "c", "d" stand for. I would suspect that "b" is the buffer size of string "a" and "d" is the buffer size of string "c".
My gut feeling is that this function is replaced by functions "DrgQueryNativeRMF" and "DrgQueryNativeRMFLen" plus possibly "DrgQueryTrueType" and "DrgQueryTrueTypeLen".