I have downloaded an advantage database on my c\temp\ccsodata directory. Its pretty much just the DBF,CDX,and FPT files. I used Advantage data architect to test my queries. I have the connection properties in Advantage data architect set as such:
ConnectionPath: C:\temp\CCSODATA
TableType: cdx
ServerType: local
CommunicationType: default
LockingMode: proprietary
CharType: ansi
SecurityMode: ignorerights
DBFTableType: cdx
TableMakss: *.adt,*.dbf