David,
 
 DS> Is there any way to test to see if
 DS> 1. file is a valid format
Um, you mean whether or not an a tablename is a valid .DB or .DBF?  If so, 
try opening a TCursor on it.  If it fails, then check the error message.  I 
believe there's a specific error code for "Not a valid table."  You should be 
able to use errorCode() to test that condition and react accordingly.
 
Otherwise, it _might_ be possible that isTable() will work as well, though I 
haven't tried that for this particular use.
 DS> 2. index is valid
Again, the best way is to simply try a switchIndex and check out the 
errorCode() if it fails.
 
Hope this helps...
 
-- Lance
--- Maximus 2.02
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