SELECT SUM( field1 + field2) w/ Paradox table won't work ?!?

I was able to do this:
        SELECT SUM(field1 + field2)
when I used an ODBC driver.  Now I'm switching to Paradox 5.x tables,
and I get 'Capability Not Supported' message when I try to activate the
TQuery component.
Is there a way around this?  Special syntax for paradox?

-- tim