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Starting with version 10.7, Apple "removed double-click support for images using legacy metadata." DiskImageMounter will not be able to open. It is found in /System/Library/CoreServices/DiskImageMounter.app. The only GUI the program ever displays is a window with a progress bar and mount options (cancel or skip verification) or an error report if it could not mount the image. Like BOMArchiveHelper, DiskImageMounter has no GUI when double-clicked doing so does nothing. DiskImageMounter works by either launching a daemon to handle the disk image or by contacting a running dæmon and have it mount the disk.
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DiskImageMounter is the utility that handles mounting disk volume images in Mac OS X, starting with version 10.3.
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