Server Administration :: Use CSSCAN To Scan Through Database

Since the past, our developer uses this command

"update props$　set value$ set = 'ZHS16GBK' where name='NLS_CHARACTERSET' ;" and
update props$　set value$='WE8MSWIN1252' where name='NLS_CHARACTERSET';
to update the sys table which is not supported by oracle.

However, I decided to use CSSCAN to scan through the database and see if the new character set will work.But before using CSSCAN, I will like to know which character set to set back as our developer does not know which is the original character set.