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Message: <blockquote data-quote="oposky2006" data-source="post: 1022052" data-attributes="member: 129515">You're right, there was a typo: dyld's shared cache. It's explained in Onyx. If you don't understand what Onyx says, you probably won't understand my tech explanation either. But it's a completely safe operation, and will not harm your system. It sort of makes sure that everything knows where everything is.Launch services is on the same tab as the dyld's shared cache operation, directly above the cache operation. It's also completely safe. It links (or re-links) documents to apps, and eliminates duplicate links (for example, if you do an "Open with..." and you see the same app twice, it'll get rid of that).In both cases, it's a good idea to not do anything else while the software is working. It shouldn't take more than a minute or two to finish.</blockquote>