When upgrading the cache from 1.4.2 or 1.5.0 to 6.0, any shortcuts created by earlier version will be re-created for 6.0, even if they were manually removed.

We need to use code to detect if shortcut really exists before deleteing it and re-creating it.
This may be a problem if originally there were desktop and menu shortcut, the the user removes one or the other , then upgrades to 6.0.
We should, even in such a case, only restore the shortcuts that existed before the upgrade.