That article appears to answer my question: it seems that ExtFS allows you to mount a Linux file system partition as a named drive letter, which can then be used just like any other local or network drive, by any Windows program.
That’s what I wasn’t sure of: I was sure that it would let you access the data on the drive, but I didn’t know if it would only allow access via a Paragon GUI (rather like the WD Desktop app allows access to the MyCloud), or whether it would allow ‘mapped drives’, available for use by all Windows programs.
