This is what I use in the INIT of my web service class to inform it where the data resides:

LOCAL cHomedir
*- StartMode = 5, started as DLL.  Otherwise development environment
cHomedir = IIF(_VFP.STARTMODE = 5, JUSTPATH(_VFP.SERVERNAME), SUBSTR(JUSTPATH(SYS(16, 0)), 25))
OPEN DATABASE (cHomedir + '\data\CBFC.dbc') SHARED
USE cbfcUsers IN 0

Charlie