@Override
	public GFile lookup(String path, Comparator<String> nameComp) throws IOException {
		return fsIndexHelper.lookup(null, path, nameComp);
	}
If an MD5 value is provided here it will be carried through the rest of the
system. If null is used instead then the MD5 will be calculated from the
bytes of the file.
Ghidra/Features/FileFormats/src/main/java/ghidra/file/formats/cart/CartFileSystem.java