header issue

Anyone know why when I strip the headers from the .tiz files during extraction, the game refuses to reconize the .tis files once I biff them?

If I just extract the files normally, and dump them in the override, it works fine. At one point, NI game me some strange error indicating that the files were missing something. This was after they were biff'd

I'm using a mac, but I'm still using tisunpack with -s -h so it should work fine. And it does on TDD and SoS, no problems stripping the headers and biff'ing the files there.