Is there no other way to add new runtimes in DS than to scan a complete dirve? Like pointing to a specific folder, like you do in Poser?
In DS4.5, windows (since that’s what I have)
On the Content Library panel, from the little options menu thingy
Select Content Directory Manager
Select the appropriate directory type (Poser Format, presumably)
Under Directory, click “add”
Browse to desired parent folder.
Select that, and you should be good.