This is a good tool to have, especially considering the wonkiness of MS W10 updates.
It's more detailed description can be found here: https://support.microsoft.com/en-us/help/4538642/windows-10-restore-lost-files .
It has 3 modes of deployment (from the Thurrott article):
Default mode. This mode uses the Master File Table (MFT) to locate lost files. Default mode works well when the MFT and file segments, also called File Record Segments (FRS), are present.
Segment mode. This mode does not require the MFT but does require segments. Segments are summaries of file information that NTFS stores in the MFT such as name, date, size, type, and the cluster/allocation unit index.
Signature mode. This mode only requires that the data is present and searches for specific file types. It doesn’t work for small files. To recover a file on an external storage device, such as a USB drive, you can only use Signature mode.
Here's the command line syntax from the MS support link:
Hope this helps if the unthinkable, yet all too common occurs.