Hello
 
The file {Install}\lib\HCI\readme.txt explains it a little bit.
 
 ansisi.lib   is used when you specify you want no floating point support. (option -D__NO_FLOAT__ )
 ansisf.lib   is used when you want to get float represented as 32-bit IEEE and double as 64-bit IEEE 
                  (option -Cf)
 ansis.lib    is used when you want to have both float and double represented as 32 bit IEEE.
 
As far as I can tell the 3 choices are available in the wizard for floating point support.
 
I hope this makes it a little bit clearer.
 
CrasyCat