I use a table that I call something like Parameters.local, with a field in it called localdir, then run code like

USE parameters.local
If localdir() <> sys(5) + curdir()
DO setup
DO setdatapaths
ELSE
ON error do setup
DO setdatapaths
ENDIF

Thus , users can move their local files to their hearts content! And if the
main data is moved, the error causes setup to run again

This allows multi company operation too, if you want to put in some selectors!