该encoding的办法:
http://support.sas.com/kb/15597
We use Wlatin1 as the example of desired encoding type.
Here is example code (Windows) to convert an entire SAS data library:
libname inlib cvp 'c:\temp';
libname outlib 'c:\' outencoding='wlatin1';
proc copy noclone in=inlib out=outlib;
run;