Erik Kostson
Ansys Employee
Think this has been answered before - see also this link:

Even though it says import it actually reads/imports it from the full file say into a parameter (Matkd say) and then using the *export or *print it exports this matrix (Matkd) to a file.
again go through this example:
it is very good and clear - also refer to the help manual for *smat commands,..