What to do when no Codec Info is present

Hi all.

I went Googling for an answer, and this topic came up.
I know it is a bit old, but it very relevant to my question.

Sometimes I purchase FLAC music from zdigital.
The only problem is, they never have codec information present. It is just blank.

I have been using mp3tag for years, but I have also used Tag&Rename from time to time, and if Tag&Rename finds empty codec information, it automatically adds Tag&Rename as the codec version. That's even worse.

I have been looking for software to that can edit this.
It's a shame that mp3tag cannot do it.

I have seen that someone posted a program called MP3 Diags, but it doesn't support FLAC.
Any ideas?

Thank you...

PS: I also found an older topic about it here titled Codec / Version.