Do you have read access to the database's meta-data? It looks to me like base64 too, but the character encoding of the underlying data is of importance: is it ASCII, which codepage? Is it UTF8? etc.
Thaddy, if it
is base64 then by definition the data must be plain ASCII, isn't it? After all, that's the conventional use of that type of codification, to transfer across channels where one can't be sure 8 bits/char would survive intact.
Another thing would be the "codepage", if any, of the decoded result but since in this case (as in most where base64 and similar codings are used) the result is a binary object, it shouldn't matter.