that`s really not an useful answer....so, its not useable
Sorry i think you can read the bluestacks forum but... :roll:
Anyway, so I've done it for you:
You can use a filemanager e.g. "total commander" or "OI file manager" and then you can see ../data/windowsdata/..
Here you can find your PC HDs und USBdevices C, D, E, F, G...
Now you can copy some files to bluestacks.
(i do this with some mapfiles now -> and it workes!)
and the path for locus offline maps is the same as before:
..locus/maps/... e.g "mymap.sqlitedb"
edit:and the path for locus vectormaps is the same as before:
..locus/mapsVector/.. e.g. "yourmap.map"