Steve
Did you follow this bit from Richard's post?
The problem with Vista / Win7 is they they appear not to auto-discover the Samba server through network discovery. When network discovery works under Win 10 it maps to a folder called "My Contents" which is, effectively, the root folder. All the other folders, Recordings / Media (Downloads / Music / Video / Photo) are sub-folders of "My Contents" and can be accessed or mapped using network addressing i.e. \\IP Address\Folder but you cannot access the "My Contents" folder in this way and if you do not have access to "My Contents" you do not have access to the DTCP-IP file (Digital Transmission Content Protection) which is the algorithm needed to decrypt the SD recordings over Samba.
On my Win 7 PC I can't see "My Contents" so decrypt wont work.
Brian