You can flash(only flashing is supported) with XS++3.1,and yes XS don't have W200 listed,but you can put custom files in XS folder "own_custpack" and instead phone model select "own_custpack".So that means you select MAIN,FS and "own_custpack" and hit flash, but don't forget to unzip CUSTOM and you get folder tpa-that folder put in XS folder
own_custpack