You can drop FS98 planes into the CFS Aircraft folder and fly them, but unless
you add a dp file, you will have no weapons or damages from other planes. Also
the flight characteristics of FS98 planes are somewhat different than the CFS
aircraft. Typically they fly hotter and handle unrealistically.(I've got an
Lockheed L-10 'Electra' which will do 245 mph in CFS while in FS2K, it chugs
along at a fairly correct 200-210mph) Also they are scaled differently so you
will notice that they are a lot smaller than the stock CFS A/C.

I would like to use one of my FS98 aircraft in CFS. Does it have to be
converted in any way or can I just install it into the CFS/Aircraft directory?

Thanks.

Patrick