All that the substrate command does is to assign a drive letter to a folder.
It's used at the command line
I was just suggesting it as a means of shortening the path.
Say your external drive is E: and your calibre library is at E:\My Backup\Users\Peter\Documents\Calibre Library
Entering at a command prompt subst y: E:\My Backup\Users\Peter\Documents would allow you to access your library at. y:\Calibre Library
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