How to open "BigTIFF" files?
Yes, macOS includes the Preview app which can open large TIFF images.

By default, the Preview app is located within your Applications folder.

The Preview app actually offers a lot of functionality, including:


opening images and PDFs
editing images and PDFs
signing documents
sharing files
annotation


For more details, see this page.

If I've misunderstood your question, please feel free to clarify it.