Select Yes from the drop-down list to mark this component's key file as shared. If the key file is component's files are component's files are installed and its the the component's Shared property is set to Yes, a reference count (a tally maintained for each shared file under HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\SharedDLLs) for each file for each file is created in the registry, if necessary, and incremented.

In fact, the installer will increment any existing reference count for any file in a component whether or not you mark the component as shared. However, if no reference count exists, the installer will not create one unless you specify that the component's key file is shared.