Search : Find all searches for all items containing a given substring and displays them using the Search browser. The collection of items found with Search : Find all is not lost when you quit the Search browser. It is preserved in a disk file with the extension FND between SuperMemo sessions. You can review the sequence of found items by choosing Browse : Searched any time before choosing Search : Find all again, and before you run Tools : Garbage.
The file with the extension FND can always be deleted without a detriment to the database integrity.