This interface is implemented by a file system item component in order to provide icon information to Merge.
Provides a handle to an Image List (HIMAGELIST) and an index into the image list. The image list is assumed to contain images of up to 17x17 pixels in size. The property should return low or high-colour images based on the colour depth supported by the user’s primary display.
For folders, this argument determines whether an open or closed version of the folder icon should be returned. For files, this argument has no meaning.
An output parameter that is to receive the index of the image within the image list. Indexes are based at 0, not 1.