If the rendering mechanism and format string for the object are NULL, FALSE is returned. If TRUE is returned, the format of the string is:
(mechanism(1)[,mechanism(n)...]), (format(1)[,format(n)...])
The native rendering mechanism and format are the first ordered pair, or the first ordered pair produced by a cross product, in the string associated with hstrRMF in the DRAGITEM structure.
DrgQueryNativeRMFLen can be used to determine the size of the buffer required to hold the string returned by this function.