protected DataTypeArchive openDomainFile(DomainFile domainFile, TaskMonitor monitor)
			throws VersionException, CancelledException, IOException {
		DataTypeArchive dta =
			(DataTypeArchive) domainFile.getDomainObject(this, false, false, monitor);
		return dta;
	}
Simple, non-ui implementation of the {@link DataTypeArchiveService} interface.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/datamgr/archive/DefaultDataTypeArchiveService.java