Program To Verify CBZ.files

A while ago, I had downloaded a freeware program that verified that I had proper CBZ files. This helped to address issues that I was experiencing when I tried to import files from my YacReader Library to my iPad, but would receive file import errors. I had to reformat my hard drive and cannot remember the name of the program. Does anyone know what I am referring to?

u mean TrID/32 - File Identifier v2.10 - (C) 2003-11 By M.Pontello ?

also check github.com/kanjieater/ComicEater

komga has some checks it can do on valid files